Question

Give an example when we infer the motion indirectly.

Motion CBSE Class 9

CBSE, Class 9, Exam Idea, Science

July 22, 2024

Answer

We infer the motion of air by observing the movement of dust particles or leaves and branches of trees, or simply by feeling the blowing air on our face.

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The table given below shows distance (n cm) travelled by bodies A, B and C. Read this data carefully and answer the following questions. Distance (in cm) covered by different bodies.

Time in (s) Body (A) Body (B) Body (C)

1stSecond 20 20 20

2ndSecond 20 36 60

3rdSecond 20 24 100

4thSecond 20 30 140

5thSecond 20 48 180

(i) Which of the bodies is moving with (a) constant speed? (b) constant acceleration? (c) non-uniform acceleration? (ii) Which of the bodies covers (a) maximum distance in 3rd second? (b) minimum distance in 3rd second?

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Observe the graph carefully and answer the following questions. (i) Which part of the graph shows the squirrel moving away from the tree? (ii) Name the point on the graph which is 6 m away from the base of the tree. (ii) Which part of the graph shows that the squirrel is not moving? (iv) Which part of the graph shows that the squirrel is returning to the tree? (v) Calculate the speed of the squirrel from the graph during its journey.

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Given below is the velocity-time graph for the motion of the car. What does the nature of the graph show? Also find the acceleration of the car.

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Time in (s)	Body (A)	Body (B)	Body (C)
1stSecond	20	20	20
2ndSecond	20	36	60
3rdSecond	20	24	100
4thSecond	20	30	140
5thSecond	20	48	180

Question

Give an example when we infer the motion indirectly.

Answer

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