An overview to motion in a straight line (kinematics)

1. Topic 2 - Mechanics 2.1 - Kinematics

5. All three of these quantities are vectors.

8. A ball that travels at 10ms -1 for 15s before striking a wall and rebounding at 45 o to the original path at 8ms -1 for 5s.

9. A 400m runner on a standard athletics track that completes the race in 52s.

13. Take suitable measurements to construct the corresponding velocity-time and acceleration-time graphs s /m 20.00 33.75 45.00 53.75 60.00 63.75 65.00 63.75 60.00 53.75 45.00 33.75 20.00 3.75 t /s 0 1 2 3 4 5 6 7 8 9 10 11 12 13

15. Consider the velocity-time graph for this object.

16. Let the object change velocity from (t 1 ,u) to (t 2 ,v) v t (t 1 ,u) (t 2 ,v)

24. A ball is rolled across a rough table and covers a distance of 2.37m in 16.3s before coming to rest. What is the acceleration on the ball due to the friction (assume constant) and what was the ball's initial speed?

26. A ball is kicked across smooth ground at a wall 15m away with speed 20ms -1 . The ball rebounds with speed 16ms -1 . The ball squashes by 20mm when in contact with the wall. Calculate the average acceleration exerted by the wall on the ball.

28. This is the same value as the Earth's gravitational field strength and is due to the gradient of the gravitational field at this point.

29. In Physics we approximate any small, smooth object falling in air as having an acceleration of 9.81ms -2 Free Fall

31. A ball is thrown vertically upwards with an initial speed of 2.5ms -1 . Calculate the maximum height of the ball and the total time of flight.

32. A 2kg ball rolls down a smooth slope that is 5m long. Calculate the speed of the ball as it reaches the bottom of the slope.

34. This means that as the object travels faster, the resistive forces also increase.

36. There will be no downwards acceleration.

39. What does the velocity of A look like compared to the Universe?

40. What does the same velocity look like when observed from B?

43. Be careful with calculations: v is a vector so direction must be accounted for!

45. Car B is travelling with velocity 35ms -1 due north.

46. Car C is travelling with velocity 50ms -1 due South.

48. The velocity of A relative to C

49. The velocity of B relative to C

50. The velocity of C relative to B

51. The velocity of D relative to C

52. The velocity of A relative to D