Chapter 3 - Motion
1. The change of position of a body in a particular direction is
called its __________.
2. The change of displacement of a body with respect to time is called
its __________.
3. The rate of change of position in a particular direction is called
the __________ of the body.
4. The total change in displacement divided by the total change in
time of a body is called its __________.
5. The acceleration of a body is uniform when average and
instantaneous valuesof the acceleration are __________.
6. If the body moves towards earth, neglecting air resistance and
small changes in acceleration with altitude. This body is referred to
as free falling body and its motion is called __________.
7. __________ is an agent which changes or tends to change the state
of the body.
8. __________ is the property of the matter due to which it will try
to remain in the same state.
9. When a constant force is applied on a body then it will start to
move with constant __________.
10. Mass of the body is the measure of __________.
11. Tension in string is a __________which will be produced in it
whenever it is subjected to pull.
12. The quantity of motion produced in a body is called its __________.
13. The momentum of a body is defined as the product of mass and
__________ of the body.
14. A system in which the particles of thesystem may exert some force
one upon the other because of their collision but no external force
can be applied on them is called __________ system of interacting
bodies.
15. The collision between the two bodies is the __________ if total
momentumas well as the kinetic energy of the system remain the same.
16. In inelastic collision the kinetic energy of the system will
__________ conserved.
17. If a massive body will collide elastically with a lighter body at
rest then the lighter body will start to move with a velocity equal to
__________ first body.
18. The force, which opposes the motionof body on a surface, is called
__________.
19. The friction is due to the __________ of the material of the
surfaces in contract.
20. The force of friction always acts __________ to the surfaces in contact.
21. The direction of the friction will always be __________ to the
direction of motion.
22. The friction within a fluid is called its__________.
23. The friction is said to be __________ when the body slides over the other.
24. Sliding friction is __________ than the rolling friction.
25. The ratio of limiting friction to the normal reaction acting
between two surfaces in contact is called __________.
26. In bicycles the sliding friction is replaced by __________.
27. On frictionless inclined plane the acceleration of the body is
__________ of itsmass.
28. On frictionless inclined plane where a = gsinq if q = 90° then a =
__________.
29. On an inclined plane the 'wcosq' will always be equal to __________.
30. According to the second law of motion average force applied on the
body is equal to its rate of change of __________.
31. __________ friction arises when one solid object is set into
motion across the surface of another solid body.
32. __________ friction results when a solid object moves through fluid.
33. 1 newton = __________ dynes.
34. The acceleration produced in the body if the applied force is
equal to the weight of the body is __________.
35. The law of conservation of momentum is equivalent to the Newton's
__________ law of motion.
36. The motion of jet plane and rocket are based on conservation of __________.
37. When the friction between the surface of an inclined plane and a
body on it is equal to the component of the weight of the body
__________ to the plane, then the body remains at rest on the inclined
plane.
38. The acceleration of body on a smooth inclined plane is maximum
when the plane is making an angle of __________ with the horizontal.
39. The terminal velocity of a spherical body in fluid is inversely
proportional to the __________ of the body.
40. In fluid the acceleration of spherical body becomes zero when the
force of gravity is equal to the __________ force offered by the fluid
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