Sunday, 26 February 2017

Important Questions and answers on Motion for Class 9 physics

Question 1

Below Figure represents the speed time graph for a particle. Find the distance covered by the particle

a) between t= 30min. and t= 40min.

b) between t=10 min and t=40 min

c) what is the speed of the particle





Question 2

A particle starts from rest and moves with a uniform acceleration of 5m/s2 for 10s and then it moves with a constant velocity for 4s. Later it slows down and comes to rest in 5s. Draw the velocity graph for the motion of the body and answer the following questions:

a) What is the maximum velocity attended by the body?

b) What is the distance travelled during this period of acceleration?

c) What is distance travelled when the body was moving with constant velocity?

d) What is the retardation of the body while slowing down?

e) What is the distance travelled by retarding?

f) What is the total distance travelled?





Question 3

Two object are thrown vertically upwards simultaneously with their velocities x and y respectively. Prove that

a) The heights reached by them would be in the ratio of a2: b2

b) The time taken to reach the maximum height would be in the ration of a:b

(Assume upward acceleration is –g and downward acceleration to be +g).



Question 4

True and false questions

a) Displacement cannot be zero

b) Average speed= Total distance/time

c) Average velocity = Total displacement /time

d) slope of distance-time graph indicates the speed

e) It is possible to have Object moving with uniform speed but variable acceleration.

f) It is possible to have Object moving with uniform velocity but non-uniform acceleration.



Question 5

Find the distance covered by a particle during the time interval t=0 and t=4s for which the speed time graph is shown in figure





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