Osb india Class 9 Motion DPP

 

                                      Osb India Motion Theory DPP

1. Write three differences between distance and displacement
2. Difference between uniform and non-uniform motion .
3. What do you mean by average speed
4. Explain scalar and vector quantities
5. Define acceleration.
6.  Using graphical method prove s=ut+1/2 at²
7. Using graphical method prove v²-u²=2as
8. Can you think of an example when an object does not change its magnitude of velocity but only its direction of motion?
9. When we move stone in a circular orbit and release it then the stone move in straight line. Why?
10. When will say (I) body is in uniform acceleration (ii) body is in non-uniform acceleration
11. Are rest and motion is relative term? Explain why
12. If the displacement of a body is zero, is it necessary that the distance coyered by it is also zero? Why
13. Can the displacement be greater than the distance travelled by an object? Why
14. When do the distance and displacement of a moving object have the same magnitude?
15. Does the speedometer of a car measure its average speed?
16. When is the acceleration taken as negative?
17. What would be acceleration of a body if its velocity-time graph is a line parallel to the time axis?
18. Is the motion of a body uniform or accelerated if it goes round the sun with constant speed in a circular orbit?
19. How will the equations of motion for an object moving with a uniform velocity change?
20. A particle is moving in a circular path of radius r. What would be the displacement after half a circle?
21. Represent a distance-time graph for uniform and non-uniform motion of an object.
22. An object has moved through a distance. Can it have zero displacements? Support your answer with an example.
23. Give the name of the physical quantity, which corresponds to the velocity change rate. Give its SI unit.
24. Draw a velocity versus time graph of a stone thrown vertically upwards and downwards after attaining the maximum height.
25. The walls of your classroom are in motion but appear stationary. Explain.
26. The magnitude of the average velocity is equal to the average speed in which condition?
27. What is the use of the odometer of an automobile?
28. What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?
29. Why is a circulating fan an example of non–uniform motion?
30. 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.