Class 9th Science - Motion Case Study Questions and Answers 2022 - 2023
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Motion Case Study Questions With Answer Key
9th Standard CBSE
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Reg.No. :
Science
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Suppose the boy first runs a distance of 100 metres in 50 seconds in going from his home to the shop in the East direction, and then runs a distance of 100 metres again. in 50 seconds in the reverse direction from the shop to reach back home from where he started (see Figure).
(i) Find the speed of the boy.(a) 1 m/s (b) 2 m/s (c) 3 m/s (d) none of these (ii) Find the Velocity of the boy.
(a) 1 m/s (b) 2 m/s (c) 3 m/s (d) 0 m/s (iii) A boy is sitting on a merry-go-round which is moving with a constant speed of 10m/s. This means that the boy is :
(a) at rest (b) moving with no acceleration (c) in accelerated motion (d) moving with uniform velocity (iv) In which of the following cases of motion, the distance moved and the magnitude of displacement are equal ?
(a) if the car is moving on straight road (b) if the car is moving on circular road (c) if the pendulum is moving to and fro (d) if a planet is moving around the sun (v) A particle is moving in a circular path of radius r. The displacement after half a circle would be :
(a) 0 (b) πr (c) 2r (d) 2πr -
One day Rahul decided to go his office by his car. He is enjoying the driving along with listening the old songs. His car is moving along a straight road at a steady speed. On a particular moment, he notices that the car travels 150 m in 5 seconds.
(i) What is its average speed ?(a) 20 m/s (b) 30 m/s (c) 10 m/s (d) 40 m/s (ii) How far does it travel in 1 second ?
(a) 20 m (b) 30 m (c) 10 m (d) 40 m (iii) How far does it travel in 6 seconds ?
(a) 120 m (b) 130 m (c) 180 m (d) 140 m (iv) How long does it take to travel 240 m ?
(a) 2s (b) 4s (c) 6s (d) 8s (v) Which of the following statement is correct regarding velocity and speed of a moving body?
(a) velocity of a moving body is always higher than its speed
(b) speed of a moving body is always higher than its velocity
(c) speed of a moving body is its velocity in a given direction
(d) velocity of a moving body is its speed in a given direction -
Aditya started driving his car. He increases the speed till 4 seconds and then he kept his card in constant speed for 6 seconds. Then after he decreased the speed of the car upto another 6 seconds. After reaching at the starting place, he draws the speed-time graph of his 16 seconds driving as shown below:
(i) What type of motion is represented by OA ?(a) uniform velocity (b) uniform acceleration (c) negative acceleration (d) no acceleration (ii) What type of motion is represented by BC ?
(a) uniform velocity (b) uniform acceleration (c) negative acceleration (d) no acceleration (iii) Find out the acceleration of the body.
(a) 1.5 m/s2 (b) 2 m/s2 (c) 3 m/s2 (d) 1 m/s2 (iv) Calculate the retardation of the body.
(a) 1.5 m/s (b) 2 m/s2 (c) 3 m/s2 (d) 1 m/s2 (v) Find out the distance travelled by the body from A to B.
(a) 15 m (b) 30 m (c) 36 m (d) 60 m
Case Study
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Answers
