Class 9 Science Practice Set: Chapter 08 Force and Laws of Motion
Explore reliable practice materials for Chapter 08 Force and Laws of Motion tailored for Class 9 learners. Utilizing these Science worksheets ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
Download Chapter 08 Force and Laws of Motion Worksheet PDF
Access the complete worksheet PDF for Chapter 08 Force and Laws of Motion below. Regular practice with these targeted questions builds familiarity with standard exam patterns and helps secure higher marks in final Science evaluations.
Question. What can you say about the motion of an object whose distance - time graph is a straight line parallel to the time axis?
Answer : If distance time graph is a straight line parallel to the time axis, the body is at rest.
Question. What is the quantity which is measured by the area occupied below the velocity -time graph?
Answer : The area below velocity-time graph gives the distance covered by the object.
Question. What does the odometer of an automobile measure?
Answer : The odometer of an automobile measures the distance covered by an automobile.
Question. A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?
Answer :
Given, Side of the square field= 10m
Therefore, perimeter = 10 m x 4 = 40 m
Farmer moves along the boundary in 40s.
Displacement after 2 m 20 s = 2 x 60 s + 20 s = 140 s =?
Since in 40 s farmer moves 40 m
Therefore, in 1s distance covered by farmer = 40 / 40 m = 1m
Therefore, in 140s distance covered by farmer = 1 × 140 m = 140 mNow, number of rotation to cover 140 along the boundary= Total Distance /
Perimeter
= 140 m / 40 m = 3.5 round
Thus, after 3.5 round farmer will at point C of the field.
Thus, after 2 min 20 seconds the displacement of farmer will be equal to 14.14 m north east from intial position.
Question. Distinguish between speed and velocity.
Answer :
| Speed | Velocity |
| Speed is the distance travelled by an object in a given interval of time. | Velocity is the displacement of an object in a given interval of time. |
Speed = distance / time |
Velocity = displacement / time |
| Speed is scalar quantity i.e. it has only magnitude. |
Velocity is vector quantity i.e. it has both magnitude as well as direction. |
Question. During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 108 m s−1.
Answer :
Speed= 3 × 108 m s−1
Time= 5 min = 5 x 60 = 300 secs. Distance= Speed x Time
Distance= 3 × 108 m s−1 x 300 secs. = 9 x 1010 m
Question. A bus decreases its speed from 80 km h−1 to 60 km h−1 in 5 s. Find the acceleration of the bus.
Answer :
Question. State which of the following situations are possible and give an example for each of these:
(a) an object with a constant acceleration but with zero velocity.
(b) an object moving in a certain direction with an acceleration in the perpendicular direction.
Answer :
(a) Possible
When a ball is thrown up at maximum height, it has zero velocity, although it will have constant acceleration due to gravity, which is equal to 9.8 m/s2.
(b) Possible
When a car is moving in a circular track, its acceleration is perpendicular to its direction.
Question. An artificial satellite is moving in a circular orbit of radius 42250 km.
Calculate its speed if it takes 24 hours to revolve around the earth.
Answer :
Radius of the circular orbit, r= 42250 km
Time taken to revolve around the earth, t= 24 h
Speed of a circular moving object, v= (2π r)/t
=[2× (22/7)×42250 × 1000] / (24 × 60 × 60)
=(2×22×42250×1000) / (7 ×24 × 60 × 60) m s-1
=3073.74 m s -1
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Chapter 08 Force and Laws of Motion Practice Sheet and Solutions for Class 9 Science
Chapter Practice Questions for Class 9 Science
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FAQs
You can download the teacher-verified PDF for CBSE Class 9 Science Force and Laws of Motion Worksheet Set 03 from StudiesToday.com. These practice sheets for Class 9 Science are designed as per the latest CBSE academic session.
Yes, our CBSE Class 9 Science Force and Laws of Motion Worksheet Set 03 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 9.
Yes, we have provided detailed solutions for CBSE Class 9 Science Force and Laws of Motion Worksheet Set 03 to help Class 9 and follow the official CBSE marking scheme.
Daily practice with these Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 9 students get more marks in CBSE exams.
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