Question

MOTION
Short Answer Type Questions
17. Is the uniform circular motion accelerated ? Give reasons for your answer.
18. Write the formula to calculate the speed of a body moving along a circular path Give the meaning of each
symbol which occurs in it.
19. Explain why, the motion of a body which is moving with constant speed in a circular path is said to be
accelerated
20. What is the difference between uniform linear motion and uniform circular motion ? Explain with examples.
21. State an important characteristic of uniform circular motion Name the force which brings about uniform
circular motion.
22. Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. The retardation due to
brakes is 2.5 m/s2
23. Describe the motion of a body which is accelerating at a constant rate of 10 ms. If the body starts from rest,
how much distance will it cover in 2 s?
24. A motorcycle moving with a speed of 5 m/s is subjected to an acceleration of 0.2 m/s?. Calculate the speed of
the motorcycle after 10 seconds, and the distance travelled in this time.
25. A bus running at a speed of 18 km/h is stopped in 25 seconds by applying brakes. Calculate the retardation
produced.
26. A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed
acquired and the distance travelled in this time.
27. Name the two quantities, the slope of whose graph gives :
(a) speed, and
(b) acceleration
28. A cheetah starts from rest, and accelerates at 2 m/s2 for 10 seconds. Calculate
(a) the final velocity
(b) the distance travelled.
29. A train travelling at 20 m s'accelerates at 0.5 m s-for 30 s. How far will it travel in this time?
30. A cyclist is travelling at 15 ms. She applies brakes so that she does not collide with a wall 18 m away.
What deceleration must she have ?
31. Draw a velocity-time graph to show the following motion :
A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.
32. The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell
you
about
(a) the train's velocity, and (b) about its acceleration ?
ong Answer Type Questions​

Answer 1

Answer:

1)in uniform circular motion direction is changed continously therefore it is accelerated.

2)speed =distance /time

Circumference /time.

3)see the first ans.

4)uniform circular motion is accelerated but uniform linear motion is not accelerated.

5)uniform circular motion is changes its direction continuously. And the force which brings uniform circular motion is centripetal force.

6)v=0

T=10

A=-2. 5

Equation used here

V=u +at

0=u+10 x(-2.5)

0=u+(-25)

Then u=25

Sorry yar you have lots of questions. I have no time to give all answers sorry.