Chapter 3 Motion and force.

1. When force is applied on body its mass remains Constant

2. Displacement-time graph is called  Velocity

3. Displacement-time graph may be Negative

4. Distance-time graph can never be Negative

5. Slope or gradient of v-t graph is called  Acceleration

6. Area under v-t graph is called Distance traveled

7. Free fall motion is  9.8 ms-2 or 32 ft s-2

8. Newton’s first law of motion is also known as  Law of inertia

9. Newton’s second law of motion F=ma

10. Newton’s third law of motion FAB = -FBA

11. Linear momentum was called quantity of motion by Newton

12. The rate of change of momentum is equal to Force acting on body

13. The product of F and t is called impulse of force, represented by J

14. In an elastic collision both kinetic energy and momentum is Conserved

15. In an inelastic collision momentum is conserved but kinetic energy is not Conserved

16. The type of collision in which before and after collision appear on singe line  Head-on collision

17. The relative speed of approach is equal to relative speed of separating for two  Bodies colliding elastically

18. Projectile motion is two dimensional under an action of Gravity

19. The vertical component of velocity in projectile in highest is  Zero

20. The horizontal component of velocity of projectile remains Constant

21. In projectile motile motion the upward quantities are taken Positive

22. In projectile motile motion the downward quantities are taken Negative

23. Height of projectile Vi2 sin2 θ/2g

24. Range of projectile Vi2 sin2θ/g

25. Time of projectile 2Vi sin θ/g

26. If kinetic energy of body is increased by 300%, the increase in momentum is 100%

27. The vertical velocity of projectile at its maximum height is  zero.

28. The velocity of projectile at its maximum height is  minimum.

29. Two equal, non parallel and non concurrent forces that produce only angular acceleration are called Couple.

30. The minimum number of unequal forces that keep the body in equilibrium are 2

31. A ball is thrown from window of moving train, It hit the ground by Parabolic path

32. A man throws a ball vertically in accelerated train, he ball will fall in His hand

33. A jet drops a bomb when it is above the target but it miss it due to Horizontal component of the velocity of bomber

34. To jump long, a jumper should jump at 450

35. The range of projectile is the same for two angles which are mutually Complementary

36. The path of projectile is parabolic in shape and is called Trajectory

37. The change in position of body is called  Displacement

38. Inertia of body is measured in terms of  Mass

39. If velocity is increasing, the acceleration is  Positive

40. When bullet is fired by the gun, the gun moves backward with velocity  Less than bullet

41. The three equations of motion are useful for  Linear motion

42. Newton’s laws are applicable in  Inertial frames only

43. If two objects are moving with the same velocity, it’s difficult to stop the  Massive of the two

44. Acceleration of bodies of different masses are  The same

45. Rate of change of momentum is called  Impulse

46. The product of force and duration of impact is called  Impulse

47. A collision in which both K.E and momentum is conserved is called  Elastic collision

48. a collision in which momentum is conserved but K.E is not, is called  Inelastic collision

49. The laws of motion show the relation between  a and F

50. Inertial mass and gravitational mass are  Identical

51. A frame of reference stationed on earth is called  Inertial frame

52. The relation between range and maximum range  R=R0sin2θ

53. Newtonian physics does not hold true in case of  Atomic particles

54. The conservation of linear momentum holds true in case of  Atomic physics

55. The ballistics missiles are used only for  Short range

56. The collisions between atomic particles, nuclear particles and fundamental particles are  Truly elastic collision

57. A 5kg mass is falling freely, the force acting on, it will be  Zero

58. Dimension of momentum is similar to that of  Impulse

59. The vertical height and horizontal range will be equal, if angle of projection is  760

60. In rotational motion the analogue of force is  Torque