Maharashtra Board Class 6 Science Chapter 10 Force and Types of Force Solutions

Class 6 Science Chapter 10 Force And Types Of Force Question Answer Maharashtra Board

Choose The Term And Fill In The Blanks:

Question a. has to be applied to change the ........... of a ........... object. (moving, direction, force)
Answer: force, direction, moving
In simple words: Force is needed to change an object's direction or state of motion.

🎯 Exam Tip: Understanding the basic definition of force and its effects is crucial for answering fill-in-the-blanks questions.

Question b. When an elephant drags a wooden log over the land, the forces that are applied on the log are ........... and ........... (muscular force, mechanical force, gravitational force, frictional force)
Answer: muscular force, gravitationalforce, frictionalforce.
In simple words: When an elephant pulls a log, it uses muscular force, the Earth's gravity acts on the log, and friction opposes its movement.

🎯 Exam Tip: Identify all forces acting in a given scenario, including applied, gravitational, and resistive forces.

Question c. A ball was set rolling on a large table. If its .... has to be changed, a ...... will have to be applied on it. (force, motion, gravitation)
Answer: motion, force
In simple words: To change the motion of a rolling ball, a force must be applied to it.

🎯 Exam Tip: Remember that force is required to change an object's state of motion, including its speed or direction.

Question d. The force of friction always acts ........... the motion. (along, against)
Answer: against
In simple words: Friction always works in the opposite direction to an object's movement, slowing it down.

🎯 Exam Tip: Grasp the concept that friction is a resistive force that opposes motion.

Match The Following:

🎯 Exam Tip: Familiarize yourself with common examples of each force type to accurately match them in exams.

One Or More Forces Are Acting In The Following Examples. Name Them.

Question a. An object falling from a tall building
Answer: Gravitational force
In simple words: Gravity is the force that pulls any object downwards towards the Earth when it falls from a height.

🎯 Exam Tip: Remember that gravity is always acting on objects near the Earth's surface, causing them to fall.

Question b. An aeroplane flying in the sky.
Answer: Mechanical force
In simple words: An aeroplane uses engines and moving parts to generate thrust and lift, which are forms of mechanical force, to fly.

🎯 Exam Tip: Mechanical force involves the use of machines or mechanisms to produce motion or work.

Question c. Sqeezing sugarcane juice with a squeezer.
Answer: Muscular or mechanical force
In simple words: Squeezing sugarcane juice can involve either human muscle power (muscular force) or a machine (mechanical force).

🎯 Exam Tip: Consider if the action involves direct body effort or the use of a tool/machine to determine the force type.

Question d. Winnowing foodgrain
Answer: Muscular force, gravitational force
In simple words: Winnowing uses muscular force to toss the grains, allowing the lighter chaff to be blown away by wind, while gravity pulls the heavier grains down.

🎯 Exam Tip: Many real-world activities involve a combination of different forces acting simultaneously.

Explain In Your Own Words Giving One Example Each.

Question a. Muscular force:
Answer: The force applied with the help of muscles is called muscular force. e.g. When a bullock pulls the load of a cart with sugarcane, he uses the force of his muscles that is muscular force.
In simple words: Muscular force is the force generated by the contraction of muscles in living beings, used for activities like lifting or pulling.

🎯 Exam Tip: Provide a clear definition and a relevant example for each type of force to score full marks.

Question b. Gravitational force:
Answer: The force applied by the earth to pull the objects towards itself is called gravitational force. e.g. When a fruit falls from a tree, it is the gravitational force of the earth that pulls the fruit.
In simple words: Gravitational force is the attractive force exerted by the Earth on all objects, pulling them towards its center.

🎯 Exam Tip: Understand that gravity is responsible for objects falling and keeping things on the ground.

Question c. Mechanical force:
Answer: The force applied by means of a machine is called mechanical force. Some machines run by muscular force while some use electricity or fuel. e.g.Washing machine, electric pump uses electricity to work.
In simple words: Mechanical force is the force generated by machines, often using electricity, fuel, or even muscular input to perform tasks.

🎯 Exam Tip: Distinguish between mechanical force (from machines) and muscular force (from living beings).

Question d. Electrostatic force:
Answer: Static electricity is produced on materials like rubber, plastic and ebonite due to friction. The force exerted by such electrically charged materials is called electrostatic force, e.g. When a plastic comb is rubbed against the dry hair, comb develops electrostatic charge.
In simple words: Electrostatic force occurs between electrically charged objects, usually created by friction, causing attraction or repulsion.

🎯 Exam Tip: Remember that electrostatic force is a non-contact force resulting from static electric charges.

Question e. The force of friction:
Answer: When two surfaces rub against each other, a force of friction is produced. This force always acts against direction of motion, e.g. A ball rolling over a flat surface stops at certain distance due to friction between the ball and the surface.
In simple words: Friction is a resistive force that arises when two surfaces slide or try to slide over each other, opposing their relative motion.

🎯 Exam Tip: Explain friction as a force that opposes motion and provide a clear, relatable example.

Question f. Magnetic force:
Answer: The force exerted by a magnet is called magnetic force. e.g. In a pin holder, the magnet attracts the pins.
In simple words: Magnetic force is the attractive or repulsive force exerted by magnets on magnetic materials like iron.

🎯 Exam Tip: Understand that magnetic force acts without direct contact and is specific to magnetic materials.

Why?

Question a. Machines are oiled from time to time.
Answer: To reduce the friction between the parts of machines, they are oiled. This will help efficient working of machines.
In simple words: Oiling machines reduces friction between moving parts, allowing them to operate more smoothly and efficiently.

🎯 Exam Tip: Relate lubrication to the reduction of friction and improved performance of mechanical systems.

Question b. An object thrown upwards comes down after reaching a point.
Answer: An object is pulled by the gravitational force of the earth. Hence an object thrown upwards comes down after reaching at certain point.
In simple words: All objects thrown upwards eventually fall back down due to the Earth's gravitational pull, which constantly acts on them.

🎯 Exam Tip: Recognize gravity as the constant downward force acting on objects, regardless of their initial motion.

Question c. Powder is sprinkled on a carrom board.
Answer: When powder is sprinkled on a carrom board, friction between the coin and the board decreases so that the coin can be pocketed easily.
In simple words: Powder on a carrom board reduces friction, making the coins slide more easily and smoothly across the surface.

🎯 Exam Tip: Understand how lubricants like powder decrease friction to facilitate movement.

Question d. The ramp at a railway station has a rough surface.
Answer: The rough surface of the ramp increases the friction between feet and the surface. This helps us to walk on the ramp without skidding or falling.
In simple words: Ramps at railway stations are made rough to increase friction, preventing people from slipping and ensuring safe walking.

🎯 Exam Tip: Explain that increasing surface roughness increases friction, which is essential for grip and preventing falls.

In What Way Are We Different?

🎯 Exam Tip: Differentiate between forces based on their source-biological muscles vs. man-made machines.

🎯 Exam Tip: Compare and contrast forces by their nature (contact vs. non-contact) and their primary effect (opposing motion vs. attraction due to mass).

Write Answers To The Following Questions In Your Own Words.

Question a. What are the things that can be done by applying force?
Answer: By applying force:
1. we can set an object in motion.
2. we can stop a moving object.
3. we can change the speed or direction or both of a moving object.
4. we can change the shape of an object.
In simple words: Force can start or stop an object's motion, change its speed or direction, and even alter its shape.

🎯 Exam Tip: List the various effects of force accurately, covering changes in state of motion and deformation.

Question b. What is meant by weight?
Answer:
1. The gravitational force acting on an object is called its weight.
2. Greater force must be applied to lift a greater weight.
In simple words: Weight is the measure of the gravitational force exerted on an object by a celestial body, like Earth.

🎯 Exam Tip: Understand that weight is a force (due to gravity) and is different from mass.

Question c. Which machines run on muscular force?
Answer: The machines that run on muscular force are:
1. Bicycle
2. Hand cart
3. Boat
4. Cycle rickshaw
5. Stretching of a spring
6. Ball pen
7. Vegetable chopper
8. Sharpener
9. Pulley
10. Fruit peeler
In simple words: Many simple machines rely on human muscle power to operate, assisting us in various tasks.

🎯 Exam Tip: Provide a diverse list of examples for muscular-powered machines, showing broad understanding.

Solve The Following Crossword Puzzle.

🎯 Exam Tip: Practice solving crosswords to enhance vocabulary and conceptual understanding of scientific terms. Cross-referencing clues helps in filling the grid.

Class 6 Science Chapter 10 Force And Types Of Force Important Questions And Answers

Choose The Term And Fill In The Blanks:

Question 1. When powder is sprinkled on a carrom board, friction ........... (increases, decreases)
Answer: decreases
In simple words: Sprinkling powder on a carrom board reduces the friction, allowing pieces to slide more freely.

🎯 Exam Tip: Understand the role of lubricants in decreasing friction between surfaces.

Question 2. Electrostatic force is due to ............ (gravitation, friction)
Answer: friction
In simple words: Electrostatic force arises from the buildup of static electricity, which is often generated through friction between materials.

🎯 Exam Tip: Connect the cause of electrostatic force directly to the act of friction, which creates charge separation.

Question 3. Fruits fall on the ground due to ............ force. (mechanical, gravitational)
Answer: gravitational
In simple words: Fruits fall to the ground because of Earth's gravitational force, which pulls all objects downwards.

🎯 Exam Tip: Recognize gravity as the fundamental force responsible for objects falling towards the Earth.

Question 4. Friction between two rough surfaces is ............. than between two smooth surfaces. (greater, lesser)
Answer: greater
In simple words: Rough surfaces create more resistance when rubbing together, resulting in greater friction compared to smooth surfaces.

🎯 Exam Tip: Understand that the degree of surface roughness is a primary factor influencing the amount of friction.

Question 5. The sound created by a stone dropped in a bucket of water from 100 cm height is ............ than that dropped from 20 cm height. (milder, louder)
Answer: louder
In simple words: Dropping a stone from a greater height causes it to hit the water with more force, producing a louder sound.

🎯 Exam Tip: Relate the height of fall to the impact force and subsequently to the intensity (loudness) of the sound produced.

Question 6. A scooter has stopped in the middle of the road as the petrol tank has become empty. So Raju has to use ............ force to take it to petrol pump. (mechanical, muscular)
Answer: muscular
In simple words: When a scooter runs out of fuel, a person must use their own physical strength, or muscular force, to push it.

🎯 Exam Tip: Understand that human effort to move objects directly involves muscular force.

One Or More Forces Are Acting In The Following Examples. Name Them.

Question 1. Srikant is playing basketball
Answer: Muscular force
In simple words: Playing basketball involves Srikant using his body's muscles to run, jump, throw, and dribble the ball.

🎯 Exam Tip: Identify direct physical actions as primarily driven by muscular force.

Question 2. Raju rubs a peacock feather between pages of his notebook
Answer: Electrostatic force
In simple words: Rubbing a feather between pages creates static electricity due to friction, leading to electrostatic forces.

🎯 Exam Tip: Recognize that rubbing certain materials together can generate static charges and electrostatic forces.

Question 3. When you rub the palm of your hands, you feel the heat on the palms
Answer: Frictional force
In simple words: Rubbing your hands together creates friction, which converts kinetic energy into heat, making your palms feel warm.

🎯 Exam Tip: Understand that friction often generates heat as a byproduct of opposing motion.

Question 4. A blacksmith uses a hammer to beat the hot piece of iron
Answer: Muscular force
In simple words: A blacksmith uses his physical strength, or muscular force, to wield the hammer and shape the iron.

🎯 Exam Tip: Direct physical exertion by a person implies the use of muscular force.

Question 5. A cricketer hits the ball, but it stops just before the boundary line
Answer: Frictional force
In simple words: The cricket ball stops because of the frictional force between the ball and the ground, which slows it down.

🎯 Exam Tip: Remember that friction acts to slow down moving objects on a surface.

Question 6. We can walk on the road without falling down.
Answer: Frictional force
In simple words: Friction between our shoes and the road provides the necessary grip, allowing us to walk without slipping.

🎯 Exam Tip: Recognize that friction is essential for locomotion and preventing slips.

Give Scientific Reasons:

Question 1. Magnet is used to lift heavy iron bar.
Answer: A magnet attracts the iron bar. As a result it is easier to lift the heavy iron bar using magnetic force.
In simple words: Magnets use magnetic force to attract and hold iron objects, making it easier to lift heavy iron bars.

🎯 Exam Tip: Explain the principle of magnetic attraction and its practical application in lifting magnetic materials.

Question 2. An inflated balloon when rubbed against a silk cloth, pulls the hair on our skin.
Answer: When an inflated balloon is rubbed against a silk cloth, it develops electrostatic force due to friction. This force pulls the hair on our skin.
In simple words: Rubbing a balloon on silk creates static electricity on the balloon, which then exerts an electrostatic force to attract light objects like hair.

🎯 Exam Tip: Describe how friction creates static charges and how these charges lead to electrostatic attraction.

Question 3. We are likely to slip when we walk on a oily or wet floor.
Answer: Wet or oily floor reduces the friction between our feet and surface. Hence we are likely to slip on wet or oily floor.
In simple words: Oily or wet floors reduce the friction between your feet and the ground, making it harder to grip and increasing the chance of slipping.

🎯 Exam Tip: Focus on how oil or water acts as a lubricant, significantly reducing friction and increasing the risk of slipping.

Distinguish Between:

🎯 Exam Tip: Clearly state whether the force requires contact, its cause (rubbing vs. static charge), and its effects (opposing motion vs. attraction/repulsion).

Answer The Following:

Question 1. Why do planets revolve round the sun in definite orbits?
Answer:
1. The gravitational force operates between the sun and the planets in the solar system.
2. Hence, they revolve round the sun in definite orbits.
In simple words: Planets orbit the Sun in fixed paths because of the strong gravitational force of attraction between the Sun and each planet.

🎯 Exam Tip: Emphasize the role of gravitational force as the primary factor in maintaining planetary orbits.

Question 2. Which forces are acting upon an aeroplane taking off into the sky?
Answer: Aeroplane uses mechanical force, Pilot exerts muscular force. Frictional force between aeroplane and air, gravitational force due to weight of an aeroplane.
In simple words: An aeroplane taking off experiences multiple forces: mechanical force from its engines, muscular force from the pilot, frictional force from air resistance, and gravitational force pulling it downwards.

🎯 Exam Tip: List all relevant forces, including thrust, lift (implied by mechanical force), drag (air friction), and weight (gravitational force).

Question 3. What happens to the iron nail when the magnet is taken away from it?
Answer:
1. As we take the magnet away from the iron nail, it does not attract the iron nail as magnetic force decreases.
2. Magnet is unable to exert force if the nail is not placed in the range of the magnetic field.
In simple words: When a magnet is moved away from an iron nail, its magnetic force weakens and eventually becomes zero, causing the nail to no longer be attracted once it's outside the magnetic field.

🎯 Exam Tip: Explain that magnetic force has a limited range; objects must be within the magnetic field to be affected.

Question 4. When brakes are applied while riding a bicycle, it stops after running a distance. Why?
Answer:
1. When brakes are applied while riding a bicycle, frictional force comes to act between the tyres of the bicycle and the surface.
2. This force opposes the tendency of the bicycle to stop.
3. Hence, the bicycle has to overcome this force before it stops.
In simple words: A bicycle stops after braking due to the frictional force between the tires and the road, which opposes its motion and gradually brings it to a halt.

🎯 Exam Tip: Describe how brakes engage friction, which then works against the bicycle's momentum to cause it to stop over a distance.

Can You Tell?

Question 1. What happens when you hold the two ends of a spring and pull them apart?
Answer: Its shape changes due to the force exerted by pull.
In simple words: Pulling a spring apart changes its shape by stretching it, demonstrating how force can deform an object.

🎯 Exam Tip: Understand that force can cause changes in an object's shape or dimension.

Question 2. What happens when a blacksmith hammers a red hot piece of iron?
Answer: Shape of iron piece changes.
In simple words: When a blacksmith hammers hot iron, the applied force causes the soft, heated metal to change its shape.

🎯 Exam Tip: Explain that malleable materials like hot iron can be reshaped by applying force (hammering).

Observe And Discuss:

Observe The Figures Given And Name The Force Needed For The Motion.

Question 1. Boat with boatman.
ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में एक व्यक्ति को एक नाव में बैठकर चप्पू से पानी को धकेलते हुए दर्शाया गया है। यह क्रिया नाव को आगे बढ़ाने के लिए मांसपेशियों की शक्ति का उपयोग करके की जा रही है।
Answer: Muscular force
In simple words: The boatman uses his muscles to move the boat forward by pushing the oars against the water.

🎯 Exam Tip: Identify actions involving direct physical effort to determine muscular force.

Question 2. Bullock cart.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक बैलगाड़ी को दिखाता है, जिसमें दो बैल एक लकड़ी की गाड़ी को खींच रहे हैं। गाड़ी में फसल या घास का ढेर लगा हुआ है, और बैल अपनी शारीरिक शक्ति का उपयोग करके इसे आगे बढ़ा रहे हैं।
Answer: Muscular force
In simple words: Bullocks use their muscular strength to pull the loaded cart.

🎯 Exam Tip: Recognize that animals applying force through their body are examples of muscular force.

Question 3. A tractor.
ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में एक लाल रंग का ट्रैक्टर खेत में काम करते हुए दिखाया गया है, जिसके पीछे एक हल (plough) जुड़ा हुआ है। ट्रैक्टर अपने इंजन की शक्ति का उपयोग करके खेत की जुताई कर रहा है।
Answer: Mechanical force
In simple words: A tractor uses an engine to generate mechanical force for various tasks like ploughing.

🎯 Exam Tip: Differentiate between forces generated by living beings (muscular) and those by machines (mechanical).

Question 4. Sewing machine.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक आधुनिक सिलाई मशीन को दर्शाता है, जिसका उपयोग कपड़ों को सिलने के लिए किया जाता है। यह मशीन बिजली या पैर से चलने वाली यांत्रिक प्रणाली के माध्यम से चलती है।
Answer: Mechanical force
In simple words: A sewing machine uses mechanical force, often powered by electricity or a foot pedal, to operate and sew fabric.

🎯 Exam Tip: Machines that use fuel, electricity, or internal mechanisms to produce motion or work demonstrate mechanical force.

Question 5. Fruit falling from tree.
ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में एक पेड़ से फल नीचे गिरते हुए और एक लड़का उसे पकड़ने की कोशिश करते हुए दिखाया गया है। फल पृथ्वी के गुरुत्वाकर्षण बल के कारण नीचे गिर रहा है।
Answer: Gravitational force
In simple words: The Earth's gravitational pull causes the fruit to fall downwards from the tree.

🎯 Exam Tip: Remember that gravity is the force responsible for objects falling towards the Earth.

Question 6. A man carrying heavy sac.
ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में एक व्यक्ति अपनी पीठ पर एक भारी बोरा ले जाते हुए दिखाया गया है। वह बोरे के वजन को उठाने और चलने के लिए अपनी मांसपेशियों की शक्ति का उपयोग कर रहा है।
Answer: Muscular force
In simple words: The man uses his muscles to exert force and carry the heavy sack.

🎯 Exam Tip: Any activity involving lifting, pushing, or pulling using one's body directly involves muscular force.

Question 7. A pin holder.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक पिन होल्डर को दर्शाता है जिसके अंदर एक चुंबक लगा है। यह चुंबक आसपास बिखरी हुई धातु की पिन्स को अपनी ओर आकर्षित करके पकड़े हुए है।
Answer: Magnetic force
In simple words: A pin holder often uses a magnet to attract and hold metallic pins due to magnetic force.

🎯 Exam Tip: Understand that magnetic force is an invisible force of attraction or repulsion between magnetic objects.

Question 8. A ramp.
ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में एक ढलान या रैंप दिखाया गया है जिसकी सतह खुरदुरी या बनावट वाली है। इस तरह की सतह फिसलन को कम करने और चलने या सामान चढ़ाने में सहायता करती है।
Answer: Gravitational force
In simple words: Objects on a ramp are subject to gravitational force pulling them downwards, which can cause them to slide if friction isn't sufficient.

🎯 Exam Tip: Gravitational force acts on all objects with mass, pulling them towards the center of the Earth, even on inclined surfaces.

Question 9. Carrom board.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक कैरम बोर्ड को दर्शाता है जिस पर कैरम के टुकड़े और स्ट्राइकर रखे हुए हैं। खिलाड़ी स्ट्राइकर का उपयोग करके टुकड़ों को हिट करते हैं, और इस खेल में घर्षण बल महत्वपूर्ण भूमिका निभाता है।
Answer: Frictional force
In simple words: When playing carrom, frictional force acts between the striker, coins, and the board, affecting their movement.

🎯 Exam Tip: Recognize that friction is a force that opposes motion between surfaces in contact.

Question 10. Mixer grinder.
ℹ️ चित्र व्याख्या (Diagram Explanation): इस चित्र में एक बिजली से चलने वाला मिक्सर ग्राइंडर दिखाया गया है जिसके साथ दो जार जुड़े हुए हैं। यह उपकरण भोजन सामग्री को पीसने या मिलाने के लिए यांत्रिक शक्ति का उपयोग करता है।
Answer: Mechanical force
In simple words: A mixer grinder uses electricity to generate mechanical force through its motor to blend or grind ingredients.

🎯 Exam Tip: Electrical appliances often convert electrical energy into mechanical energy to perform work.

Class 6 Science Chapter 10 Force and Types of Force Important Questions and Answers

Choose the term and fill in the blanks:

Question 1. When powder is sprinkled on a carrom board, friction ........... (increases, decreases)
Answer: decreases
In simple words: Sprinkling powder on a carrom board reduces the friction, allowing the pieces to slide more easily.

🎯 Exam Tip: Understand that friction can be reduced by making surfaces smoother or by using lubricants.

Question 2. Electrostatic force is due to ............ (gravitation, friction)
Answer: friction
In simple words: Electrostatic force is generated when materials rub against each other, causing a transfer of electrons and creating static electricity.

🎯 Exam Tip: Friction is often the mechanism by which objects acquire static electric charges, leading to electrostatic force.

Question 3. Fruits fall on the ground due to ............ force. (mechanical, gravitational)
Answer: gravitational
In simple words: The Earth's gravitational force pulls all objects towards its center, causing fruits to fall downwards.

🎯 Exam Tip: Gravitation is a fundamental force responsible for the attraction between any two objects with mass.

Question 4. Friction between two rough surfaces is ............. than between two smooth surfaces. (greater, lesser)
Answer: greater
In simple words: Rough surfaces have more irregularities that interlock, leading to a higher resistance to motion and thus greater friction compared to smooth surfaces.

🎯 Exam Tip: The degree of friction depends on the nature of the surfaces in contact; rougher surfaces generally produce more friction.

Question 5. The sound created by a stone dropped in a bucket of water from 100 cm height is ........... than that dropped from 20 cm height. (milder, louder)
Answer: louder
In simple words: A stone dropped from a greater height gains more speed and kinetic energy, resulting in a more forceful impact with the water and a louder sound.

🎯 Exam Tip: The intensity of sound often correlates with the energy of the impact; higher energy impacts produce louder sounds.

Question 6. A scooter has stopped in the middle of the road as the petrol tank has become empty. So Raju has to use ........... force to take it to petrol pump. (mechanical, muscular)
Answer: muscular
In simple words: When a scooter runs out of fuel, Raju must use his own physical strength (muscles) to push it.

🎯 Exam Tip: Direct physical effort by a person or animal to move an object is always an example of muscular force.

One or more forces are acting in the following examples. Name them.

Question 1. Srikant is playing basketball
Answer: Muscular force
In simple words: Srikant uses his muscles to run, jump, dribble, and shoot the basketball.

🎯 Exam Tip: All athletic activities that involve bodily movement rely on muscular force.

Question 2. Raju rubs a peacock feather between pages of his notebook
Answer: Electrostatic force
In simple words: Rubbing creates friction, which can build up static electric charges on the feather and notebook pages, leading to an electrostatic attraction.

🎯 Exam Tip: Friction can generate static electricity, and the resulting force is electrostatic.

Question 3. When you rub the palm of your hands, you feel the heat on the palms
Answer: Frictional force
In simple words: Rubbing palms together creates friction between the skin surfaces, which converts mechanical energy into heat, making them feel warm.

🎯 Exam Tip: Friction is a force that opposes motion and can generate heat when surfaces rub against each other.

Give scientific reasons:

Question 1. Magnet is used to lift heavy iron bar.
Answer: A magnet attracts the iron bar. As a result it is easier to lift the heavy iron bar using magnetic force.
In simple words: Magnets can lift iron objects because they exert a strong attractive magnetic force on them.

🎯 Exam Tip: Magnetic force is a non-contact force that can attract ferromagnetic materials like iron.

Question 2. An inflated balloon when rubbed against a silk cloth, pulls the hair on our skin.
Answer: When an inflated balloon is rubbed against a silk cloth, it develops electrostatic force due to friction. This force pulls the hair on our skin.
In simple words: Rubbing a balloon on silk creates static electricity on the balloon's surface, which then attracts lightweight objects like hair due to electrostatic force.

🎯 Exam Tip: Static charges built up through friction can exert electrostatic forces, causing attraction or repulsion.

Question 3. We are likely to slip when we walk on a oily or wet floor.
Answer: Wet or oily floor reduces the friction between our feet and surface. Hence we are likely to slip on wet or oily floor.
In simple words: Oil or water on a floor reduces the friction needed for grip, making it easy to slip and lose balance.

🎯 Exam Tip: A lack of sufficient friction between surfaces can lead to dangerous situations like slipping.