Samacheer Kalvi Class 6 Science Solutions Term 1 Chapter 2 Force and Motion

I. Choose the Correct Answer:

 

Question 1. Unit of speed is
(b) s
(c) kg
(d) m/s
Answer: (d) m/s
In simple words: The unit of speed tells us how much distance an object covers in a certain amount of time. Metres per second (m/s) is the standard way to measure speed.

🎯 Exam Tip: Remember that speed is calculated by dividing distance by time, so its unit will always be a distance unit divided by a time unit.

 

Question 2. Oscillatory motion among the following is
(a) Rotation of the earth about its axis
(b) Revolution of the moon about the earth
(c) To and fro movement of a vibrating string
(d) All of the options
Answer: (c) To and fro movement of a vibrating string
In simple words: Oscillatory motion is a movement that swings back and forth, like a pendulum or a vibrating string. It repeats over and over in a fixed path.

🎯 Exam Tip: To identify oscillatory motion, look for objects that move back and forth or up and down around a central point, repeating their movement.

 

Question 3. The correct relation among the following is
(a) speed = distance × time
(b) Speed = distance / time
(c) speed = time / distance
(d) Speed = 1 / (distance × time)
Answer: (b) Speed = distance / time
In simple words: To find out how fast something is moving, you divide the total distance it covered by the time it took to cover that distance. This gives you its average speed.

🎯 Exam Tip: Always remember the fundamental formula for speed: Speed = Distance/Time. This relationship is crucial for solving many physics problems.

 

Question 4. Gita rides with her father's bike to her uncle's house which is 40 km away from her home. She takes 40 minutes to reach there. Statement 1: She travels with a speed of 1 km/minute. Statement 2: She travels with a speed of 1 km/hour
(a) Statement 1 alone is correct.
(b) Statement 2 alone is correct.
(c) Both Statement 1 and 2 are correct.
(d) Neither statement 1 nor statement 2 is correct.
Answer: (a) Statement 1 alone is correct
In simple words: Gita travels 40 km in 40 minutes, which means she covers 1 km every minute. This makes her speed 1 km per minute, not 1 km per hour.

🎯 Exam Tip: Always pay attention to the units of time and distance given in a problem. Convert units if necessary to avoid errors in calculations.

II. Find Whether the Following Statements Are True or False - If False Give the Correct Answer.

 

Question 1. To and fro motion is called oscillatory motion.
Answer: True.
In simple words: When something moves back and forth in a regular way, like a swing, we call that oscillatory motion.

🎯 Exam Tip: Oscillatory motion always involves movement around a central point, repeating in a pattern.

 

Question 2. Vibratory motion and rotatory motion are periodic motions.
Answer: True.
In simple words: Both vibratory (like a guitar string) and rotatory (like a spinning top) movements happen over and over again in fixed amounts of time, making them periodic.

🎯 Exam Tip: Periodic motion is any motion that repeats itself at regular intervals. Many natural phenomena exhibit periodic motion, such as the Earth's rotation.

 

Question 3. Vehicles moving with varying speeds are said to be in uniform motion.
Answer: False, vehicles moving with varying speeds are said to be in non-uniform motion.
In simple words: If a vehicle changes its speed, it is not moving uniformly. Uniform motion means keeping the same speed all the time.

🎯 Exam Tip: Uniform motion means equal distances covered in equal intervals of time; any change in speed or direction makes the motion non-uniform.

 

Question 4. Robots will replace human in future.
Answer: False, Robots can never be conscious.
In simple words: While robots can do many tasks, they do not have feelings or thoughts like humans. They perform actions based on their programming.

🎯 Exam Tip: It's important to understand the capabilities and limitations of technology like robots; they are tools designed to assist humans, not fully replace them in all aspects.

III. Fill in the Blanks:

 

Question 1. A bike moving on a straight road is an example of ......... motion.
Answer: Linear.
In simple words: When something moves in a straight line, we call it linear motion. A bike going straight is a clear example of this.

🎯 Exam Tip: Linear motion is the simplest type of motion, characterized by movement along a straight path.

 

Question 2. Gravitational force is a ......... force.
Answer: non-contact.
In simple words: Gravitational force pulls objects towards each other, even when they are not touching. This makes it a non-contact force.

🎯 Exam Tip: Remember that non-contact forces act from a distance, like gravity or magnetism, while contact forces require physical touch.

 

Question 3. Motion of a potter's wheel is an example of ............ motion.
Answer: Rotatory.
In simple words: A potter's wheel spins around its own center without changing its place. This kind of movement is called rotatory motion.

🎯 Exam Tip: Rotatory motion involves an object spinning on its axis, while circular motion involves an object moving in a circle around an external point.

 

Question 4. When an object covers equal distances in equal interval of time, it is said to be in ............ motion.
Answer: Uniform.
In simple words: If an object travels the same amount of distance in the same amount of time, its motion is uniform. It means it is moving at a steady speed.

🎯 Exam Tip: Uniform motion is predictable because the speed and direction of the object remain constant.

IV. Match the Following:

 

Question 1. Match the motion with the given examples:
1. Child sliding down a slide
2. Spinning top
3. Two birds flying
4. Clock/wheel
5. Car on a road
(a) Circular motion
(b) Oscillatory motion
(c) Linear motion
(d) Rotatory motion
(e) Linear and rotatory motion
Answer:
1. - (c) Linear motion
2. - (d) Rotatory motion
3. - (b) Oscillatory motion
4. - (a) Circular motion
5. - (e) Linear and rotatory motion
In simple words: We match each type of movement to a real-life example. A slide gives linear motion, a spinning top shows rotatory motion, birds flying can be seen as oscillatory motion as they flap wings, a clock wheel has circular motion, and a car has both linear (forward) and rotatory (wheels) motion.

🎯 Exam Tip: When matching, carefully analyze the main characteristic of each motion type and how it applies to the given example. Sometimes, one object can exhibit multiple types of motion.

V. Analogy:

 

Question 1. Kicking a ball: contact force :: falling of leaf : ..................
Answer: non contact forces.
In simple words: Kicking a ball needs touch, so it's a contact force. A leaf falls because of gravity, which works without touching, making it a non-contact force.

🎯 Exam Tip: Understand the difference between forces that need physical contact (like pushing) and forces that act from a distance (like gravity or magnetism).

 

Question 2. Distance : metre :: Speed : ..................
Answer: m/s.
In simple words: Metre is the unit for distance, and metres per second (m/s) is the unit for speed. Units help us measure things accurately.

🎯 Exam Tip: In analogies, identify the relationship between the first pair (e.g., quantity and its SI unit) and apply the same relationship to the second pair.

 

Question 3. circulatory motion : a spinning top oscillatory motion : ..................
Answer: Pendulum.
In simple words: A spinning top shows circular motion. A pendulum swings back and forth, which is an example of oscillatory motion.

🎯 Exam Tip: Recognize common examples for each type of motion. A spinning top demonstrates rotation, which is a type of circular motion, while a pendulum is a classic example of oscillation.

VI. Given Below Is the Distance - Travelled by an Elephant Across a Forest With Uniform Speed.

 

Question 1. Complete the data of the table given below with the idea of uniform speed.

Answer: The table is completed assuming uniform speed, meaning the elephant covers equal distances in equal time intervals. If it covers 4m in 2s, its speed is 2 m/s. So, for every 2 seconds, it travels 4 meters.
In simple words: Since the speed is uniform, we fill the table by adding 4 meters for every 2 seconds that pass. This keeps the speed constant throughout the journey.

🎯 Exam Tip: For uniform speed, the ratio of distance to time (speed) remains constant. Use this constant to fill in missing values proportionally.

VII. Complete the Web Chart.

 

Question 1. Complete the web chart based on types of motion.
Answer: The web chart illustrates different types of motion and their key characteristics:

In simple words: This chart helps us understand how things move. It shows three main ways things move: non-periodic (no regular pattern), oscillatory (swinging back and forth), and rotatory (spinning around its own center).

🎯 Exam Tip: When describing types of motion, always include a clear definition and a relevant example for each category to score full marks.

VIII. Give One Word for the Following Statements.

 

Question 1. The force which acts on an object without Physical contact with it.
Answer: Non-contact force.
In simple words: Forces like gravity or magnetism can pull or push things without touching them. We call these non-contact forces.

🎯 Exam Tip: Distinguish between contact forces (e.g., friction, pushing) and non-contact forces (e.g., gravitational, magnetic, electrostatic) based on whether physical interaction is required.

 

Question 2. A change in the position of an object with time.
Answer: Motion.
In simple words: When something moves from one place to another over a period of time, it is in motion. Everything around us is often in some form of motion.

🎯 Exam Tip: Motion is a fundamental concept in physics, defined as a change in position relative to a reference point over time.

 

Question 3. The motion which repeats itself after a fixed interval of time.
Answer: Oscillatory motion.
In simple words: If a movement happens again and again, taking the same amount of time each cycle, it is called oscillatory motion. A swinging pendulum is a great example.

🎯 Exam Tip: While all oscillatory motions are periodic, not all periodic motions are oscillatory (e.g., circular motion is periodic but not oscillatory).

 

Question 4. The motion of an object travels equal distances in equal intervals of time.
Answer: Uniform motion.
In simple words: If something travels the same amount of distance in the same amount of time, without speeding up or slowing down, it has uniform motion.

🎯 Exam Tip: Uniform motion implies constant speed and direction, often represented by a straight line on a distance-time graph.

 

Question 5. A machine capable of carrying out a complex series of actions automatically.
Answer: Robots.
In simple words: Robots are machines designed to do many tasks by themselves, following instructions. They help us in many ways.

🎯 Exam Tip: Robots are examples of advanced technology that automate tasks, often involving various types of motion and sensing capabilities.

IX. Answer the Following in a Sentence or Two:

 

Question 1. Define force.
Answer: Force is a push or a pull exerted by something living (animate) or non-living (inanimate) on an object. It can cause an object to move, stop, or change direction.
In simple words: Force is like a push or a pull. It makes things move, stop, or change how they are moving.

🎯 Exam Tip: When defining force, always mention both "push" and "pull" as its fundamental actions, and its ability to change an object's state of motion.

 

Question 2. Name different types of motion based on the path.
Answer: Different types of motion based on the path taken include: 1. Linear motion, 2. Curvilinear motion, 3. Rotatory motion, 4. Oscillatory motion, and 5. Zigzag (irregular) motion. These categories help us understand how objects travel through space.
In simple words: Motion can be straight (linear), curved (curvilinear), spinning (rotatory), back-and-forth (oscillatory), or messy (zigzag).

🎯 Exam Tip: List at least three distinct types of motion based on the path to show comprehensive knowledge, providing a brief example for each if asked.

 

Question 3. If you are sitting in a moving car will you be at rest or motion with respect to your friend sitting next to you?
Answer: If I am sitting in a moving car, I will be at rest with respect to my friend who is also sitting next to me inside the same car. This is because our relative positions are not changing.
In simple words: Inside the car, you and your friend are not moving away from each other, so you are both at rest compared to each other.

🎯 Exam Tip: Always remember that rest and motion are relative terms; an object's state of motion depends on the observer's frame of reference.

 

Question 4. The rotation of the earth is a periodic motion. Justify.
Answer: The rotation of the Earth is a periodic motion because motion that repeats itself in equal intervals of time is defined as periodic motion. The Earth rotates completely on its axis once every 24 hours, meaning the time duration for one full rotation is fixed.
In simple words: Earth spinning around is periodic because it takes exactly 24 hours every time. Periodic means it repeats over and over in a regular time.

🎯 Exam Tip: To justify periodic motion, clearly state that the motion repeats and emphasize that it does so at regular or fixed time intervals.

 

Question 5. Differentiate between rotational and curvilinear motion
Answer: Rotational motion: 1. A body moves along a circular path. 2. Without changing its position, about its own (fixed) axis. 3. Eg. Rotation of a spinning top. Curvilinear motion: 1. A body moves along a curved path. 2. Changes its position with motion. 3. Eg. Throwing paper airplanes or paper darts. While both involve curved paths, rotational motion focuses on an object spinning around an axis, whereas curvilinear motion is about an object's path being curved.
In simple words: Rotational motion is when something spins in place, like a top. Curvilinear motion is when something moves along a bent line, like a thrown ball.

🎯 Exam Tip: For differentiation questions, use clear, distinct points for each concept. Ensure that the examples clearly illustrate the unique characteristics of each type of motion.

X. Calculate.

 

Question 1. A vehicle covers a distance of 400 km in 5 hours calculate its average speed.
Answer: To find the average speed, we use the formula:
Average speed \( = \frac{\text{distance}}{\text{time}} \)
Given distance = 400 km
Given time = 5 hours
Average speed \( = \frac{400}{5} \) km/hour
Average speed \( = 80 \) km per hour. Therefore, the vehicle's average speed is 80 km/h.
In simple words: You can find the average speed by dividing the total distance traveled by the total time taken. For this vehicle, it's 80 kilometers every hour.

🎯 Exam Tip: Always write down the formula first, substitute the given values, and include the correct units in your final answer for calculations.

XI. Answer in Detail:

 

Question 1. What is motion? classify different types of motion with examples.
Answer: Motion: Motion is defined as the change in the position of an object with respect to time. Everything in the universe is constantly in motion.
Classification of different types of motion with examples:
1. Based on Path:
• Linear motion. – Ex.: Parade of the soldiers.
• Curvilinear motion. – Ex.: Paper flight moving.
• Circular motion. – Ex.: Swirling stone tied to the rope.
• Rotatory motion. – Ex.: Rotating top.
• Oscillatory motion. – Ex.: Clock pendulum.
• Zigzag (irregular) motion. – Ex.: Motion of a bee.
2. Based on Duration :
• Periodic motion. – Ex.: Motion of a bob of simple Pendulum.
• Non-periodic motion. – Ex.: Swaying of the branches of a tree.
3. Based on Speed:
• Uniform motion. – Ex.: Hour hand of a clock.
• Non – uniform motion. – Ex.: Motion of a train, as it leaves a station.
Motion can be described in many ways depending on its path, how often it repeats, and whether its speed changes.
In simple words: Motion is simply things moving from one place to another over time. We can sort motions by if they go straight, curve, spin, swing back and forth, or move randomly. We also look at if they repeat regularly or if their speed stays the same.

🎯 Exam Tip: For a detailed answer, provide a clear definition of motion and then systematically classify it based on different criteria like path, duration, and speed, with appropriate examples for each sub-type.

XII. Fill With Examples

 

Question 1. Fill in the examples for each type of motion.
Answer: Here are examples for various types of motion:
Linear motion – A man walking in a straight road
Curvilinear motion – Motion of a paper Aeroplane
Self rotatory motion – Motion of a wheel in a cart
Circular motion – Motion of the moon around the earth.
Oscillatory motion – Motion of a pendulum
Irregular motion – Motion of a honey bee.
Examples help us understand different types of motion by relating them to everyday experiences.
In simple words: We can see different types of motion all around us. For example, walking in a straight line is linear motion, a paper airplane flying is curvilinear, a spinning wheel is self-rotatory, and a pendulum swinging is oscillatory motion.

🎯 Exam Tip: Always try to use common, easy-to-visualize examples when explaining types of motion, as this helps clarify the concept for the examiner.

I. Choose the Best Option:

 

Question 1. How earth revolves?
(a) From west to east
(b) east to west
(c) From north to south
(d) south to west.
Answer: (a) From west to east
In simple words: The Earth spins around its axis from west to east. This is why the sun appears to rise in the east and set in the west.

🎯 Exam Tip: Knowing the direction of Earth's rotation helps explain daily phenomena like sunrise and sunset.

 

Question 2. People walking in a crowded street is an example of ............ motion.
(a) linear
(b) circular
(c) rotatory
(d) zigzag
Answer: (d) zigzag
In simple words: When many people walk in a crowded place, they often change direction suddenly and move in an unpredictable way, like a zigzag path.

🎯 Exam Tip: Zigzag motion is characterized by sudden, sharp changes in direction, often seen in crowded environments or erratic movements.

 

Question 3. What is the unit of average speed in Sl system?
(a) metre / second
(b) kilometre/ seconds
(c) Kilometre/minute
(d) Metre/ Time.
Answer: (a) metre / second
In simple words: The standard way to measure average speed in science is using metres per second (m/s). This is part of the SI unit system used worldwide.

🎯 Exam Tip: Always use SI units (International System of Units) for scientific calculations unless otherwise specified, where distance is in meters and time in seconds.

 

Question 4. Usain Bolt crossed 100 metre in ............ seconds and made a world record.
(a) 9.58
(b) 9.83
(c) 9.85
(d) 9.38
Answer: (a) 9.58
In simple words: Usain Bolt set a world record for the 100-meter sprint by running it in a very fast 9.58 seconds. This shows incredible human speed.

🎯 Exam Tip: While this is a general knowledge fact, for science, understanding the speed (distance/time) involved in such a feat is more important than memorizing the exact number.

 

Question 5. The motion of the moon which revolves around the earth is
(a) Oscillatory motion
(b) Periodic motion
(c) curvilinear
(d) b and c
Answer: (b) Periodic motion
In simple words: The moon goes around the Earth over and over again in a regular amount of time, making its movement periodic. Its path is also curved (curvilinear).

🎯 Exam Tip: Remember that periodic motion means repeating at regular intervals. The moon's orbit is a classic example of both periodic and curvilinear motion.

II. Correct Answer: If It Is Wrong Give the Correct Answer.

 

Question 1. Change of position of an object with respect to time is motion.
Answer: Correct.
In simple words: Yes, when something moves from one spot to another over time, we call that motion. This is the basic idea of motion.

🎯 Exam Tip: The definition of motion requires both a change in position and a reference to time, highlighting its dynamic nature.

 

Question 2. Swirling stone tied to the rope is an example of rotatory motion.
Answer: Wrong. A swirling stone tied to a rope is an example of circular motion.
In simple words: When you swing a stone on a rope, it moves in a circle around your hand, which is circular motion. Rotatory motion is when something spins on its own axis.

🎯 Exam Tip: Distinguish carefully between rotatory motion (spinning on its own axis, like a top) and circular motion (moving in a circle around an external point, like a stone on a rope).

 

Question 3. The children flying in a swing is a periodic motion.
Answer: Correct.
In simple words: A child on a swing moves back and forth, repeating the same path in regular time, so it's a periodic motion.

🎯 Exam Tip: Oscillatory motions, like swinging, are a specific type of periodic motion because they repeat at regular time intervals.

 

Question 4. All the oscillatory movements are periodic motions.
Answer: Correct.
In simple words: Any movement that swings back and forth, like a pendulum, will always repeat itself after a fixed time. This means all oscillatory motions are also periodic.

🎯 Exam Tip: This is a key relationship: all oscillatory motions are periodic, but not all periodic motions are oscillatory (e.g., uniform circular motion is periodic but not oscillatory).

 

Question 5. The Sl unit of speed is kilometer.
Answer: Wrong, the SI unit of speed is meter/second.
In simple words: Kilometer is a unit of distance, not speed. Speed is measured using both distance and time, so the standard unit is meters per second.

🎯 Exam Tip: Always remember that the SI unit for distance is meters (m) and for time is seconds (s), making the SI unit for speed meters per second (m/s).

III. Fill Up the Blanks:

 

Question 1. People walking in a crowded street is ........... type of motion.
Answer: Irregular.
In simple words: When many people are walking closely together, their paths are not straight or regular; they move in an irregular way.

🎯 Exam Tip: Irregular motion lacks a predictable pattern or path, often seen in natural phenomena or crowded environments.

 

Question 2. Object moves not at a constant speed then the motion is ...........
Answer: non-uniform motion.
In simple words: If an object changes its speed while moving, it is called non-uniform motion. Its speed is not steady.

🎯 Exam Tip: Non-uniform motion implies that either the speed or the direction (or both) of an object's movement is changing over time.

 

Question 3. If Priya in her cycle travels 40 km in 2 hours then what is her average speed?
Answer: 20 km/hr.
In simple words: To find Priya's average speed, divide the distance she traveled (40 km) by the time she took (2 hours). This gives us 20 km for every hour.

🎯 Exam Tip: Practice calculating average speed by dividing total distance by total time; ensure units are consistent (e.g., km/hr or m/s).

 

Question 4. Motion is of ............ types.
Answer: four.
In simple words: Motion can be grouped into different types, like linear, circular, oscillatory, and rotational, to help us understand how things move.

🎯 Exam Tip: While there are many sub-classifications, common broad types of motion include linear, circular, oscillatory, and random (irregular).

 

Question 5. The movement of a body about its own axis is ...........
Answer: Rotatory motion.
In simple words: When something spins around its own center, like a spinning top, that specific kind of movement is called rotatory motion.

🎯 Exam Tip: The key characteristic of rotatory motion is the rotation around an internal axis, in contrast to circular motion around an external point.

IV. Matching

 

Question 1. Match the bee's motion with its type.
1. Bee flying in a zig-zag path
2. Bee flying in a circular path
3. Bee flying in an arc/curved path
4. Bee flying back and forth
(a) Oscillatory motion
(b) Curvilinear motion
(c) Non-periodic motion
(d) Circular motion
Answer:
1. - (b) Curvilinear motion
2. - (d) Circular motion
3. - (a) Oscillatory motion
4. - (c) Non-periodic motion
In simple words: Different movements of a bee can be matched to motion types. A zig-zag path can be considered curvilinear, a circular path is circular motion, an arc-like path can be oscillatory, and a back-and-forth flight might be non-periodic depending on regularity.

🎯 Exam Tip: Pay close attention to the visual representation of motion in matching questions, even if common examples sometimes blur categories. Match based on the provided options.

V. Fill Up the Blanks in Accordance With Their Relation:

 

Question 1. The Motion of train – uniform motion. The motion of vehicles ...........
Answer: non uniform motion.
In simple words: A train usually moves at a steady, uniform speed. But other vehicles often change their speed, so their motion is non-uniform.

🎯 Exam Tip: Understand that real-world examples often show non-uniform motion due to varying speeds, while uniform motion is an ideal concept.

 

Question 2. Periodic motion – The motion of the moon revolves around the earth. Oscillatory motion ...........
Answer: Motion of simple pendulum.
In simple words: The moon's path around the Earth is an example of periodic motion because it repeats regularly. An oscillatory motion is like a simple pendulum swinging back and forth.

🎯 Exam Tip: Connect the definition of each motion type with a standard, easily recognizable example to demonstrate understanding.

VIII. Two Mark Questions: Short Answers

 

Question 1. Define motion.
Answer: Motion happens when an object changes its position over a period of time. This change can be observed by comparing the object's starting and ending points. Every object around us, from a moving car to a swinging pendulum, experiences some form of motion.
In simple words: Motion is when something moves from one place to another over time.

🎯 Exam Tip: Clearly state that motion involves both a change in position and a time interval to get full marks.

 

Question 2. What are the types of Force?
Answer: Forces are generally divided into two main categories: contact force and non-contact force. Contact forces need objects to touch, while non-contact forces act from a distance without physical contact. Understanding these types helps explain how things move and interact in the world.
In simple words: There are two main types of forces: contact forces (when objects touch) and non-contact forces (when objects don't touch).

🎯 Exam Tip: Remember to name both categories of force clearly and accurately. Providing a simple example for each can further strengthen your answer.

 

Question 3. List out the types of forces on the basis of contact.
Answer: Based on whether objects physically touch each other, forces are grouped into two types: contact force and non-contact force. Contact forces involve direct physical interaction, such as pushing or pulling a cart. Non-contact forces, like gravity or magnetism, can act on objects even when they are not touching.
In simple words: Forces are either contact forces (objects touch) or non-contact forces (objects don't touch).

🎯 Exam Tip: Always specify "on the basis of contact" in your explanation to show precise understanding of the question's requirement.

 

Question 4. What is the average speed of the object?
Answer: The average speed of an object is defined as the total distance it travels divided by the total time it takes to travel that distance. It tells us how fast an object moves on average over a certain period. For example, if you travel 100 km in 2 hours, your average speed is 50 km/h.
In simple words: Average speed is how much distance an object covers in a specific amount of time.

🎯 Exam Tip: State the definition clearly and mention both distance and time as key components for calculating average speed.

 

Question 5. Define non-periodic motion.
Answer: Non-periodic motion is when an object's movement does not repeat itself at regular or fixed intervals of time. Unlike periodic motion, there is no set pattern or cycle in how the motion occurs. An example would be a bird flying in random directions. This type of motion can seem unpredictable.
In simple words: Non-periodic motion means movement that does not repeat regularly.

🎯 Exam Tip: Emphasize the absence of a "uniform interval" or "fixed period" to distinguish it from periodic motion.

IX. Give Detailed Answers

 

Question 1. What is a force? What are its types?
Answer: A force is a push or a pull that acts on an object, caused by either living things (animate agencies) or non-living things (inanimate agencies). Forces are all around us, constantly influencing how things move and change.
Based on how they interact with objects, forces are categorized into two main types:
1. Contact forces: These forces happen when objects physically touch each other. For example, when you kick a football, your foot makes direct contact with the ball to exert a force.
2. Non-contact forces: These forces act on objects without direct physical touch. Gravity, magnetic force, and electrostatic force are examples where objects influence each other from a distance.
Forces can cause several changes in objects:
(i) They can change an object's state from rest to motion, or from motion to rest.
(ii) They can alter an object's speed, direction of movement, or both.
(iii) They can also change the shape of an object.
In simple words: Force is a push or pull. It has two types: contact force (needs touch) and non-contact force (acts from a distance). Forces can make things move, stop, change speed, change direction, or change shape.

🎯 Exam Tip: For detailed answers on force, make sure to define it, list its types with examples, and explain the effects of force on an object to cover all aspects of the question thoroughly.