Regular Physics Mid-Term Review Packet



Regular Physics Mid-Term Review Packet

Ch. 1

1. What are the SI units for mass (M), Length (L) and Time (T)

2. What are the x and y components of a vector of magnitude A and makes an angle ( with respect to the x-axis.

3. At what angle are the x and y components of a vector equal. When is Ax maximum, when is it minimum ?

4. Plot the position vs time graph for an object traveling at (a) constant velocity (b) constant acceleration ?

5. Plot the velocity vs time graph for an object traveling at (a) constant velocity (b) constant acceleration ?

6. What is the height of a building whose shadow on the ground is 40 m long, when the sun is shining at 400 above the horizontal.

Ch. 2

7. What are the four equations of kinematics ? When are they applicable ?

8. What are the velocity and distance fallen of a ball dropped from rest at the top of a cliff after time = 1s, 2s, 5s.

9. What are the weight, vertical acceleration, and velocity of a 9.8 N ball thrown straight up, at the top of its path ?

10. If a projectile is thrown at 39.2 m/s initial velocity, compute the time it takes to reach max. height and total time it takes to return. What is its final velocity just before it hits the ground ?

11. When a body is thrown straight up does its vertical acceleration depend on any factor other than acceleration due to gravity ?

Ch.3

12. A cannon ball is dropped and another fired with a horizontal velocity. Which one reaches the ground first ?

13. For a projectile in motion which is the only force acting on it in the absence of air-resistance. Which direction does this force act ? Which direction is the acceleration vector oriented ?

14. What are the expressions for range and maximum height of a projectile ?

15. What launch angle gives a projectile the (a) maximum range and (b) maximum height ?

16. For a given launch angle, how can you increase the (a) maximum range and (b) maximum height ?

17. A projectile is launched at some angle and with H & V velocities of Vix and Viy. At the top of the trajectory what are the values of Vx and Vy and the resultant velocity V ?

18. At what position during the trajectory does the projectile have minimum velocity ? If Vi = 20 m/s is the launch velocity, then what is its final velocity Vf just before it hits the ground. Neglect air resistance.

19. If you are in a train traveling at a constant velocity of 70 km/h and throw a ball straight up in the air, what is its horizontal velocity (a) with respect to the train & (b) with respect to the track ?

20. If you drop the above ball in the train where will it fall. Would your result be any different if the train were at rest ?

Ch. 4

21. What is the gravitational force between two objects depend on ? When does it increase and when does it decrease ?

22. What does the acceleration due to gravity of a planet of mass MP and radius RP depend on ? Give the expression.

23. Define Normal, and Tension forces ?

24. Define static and kinetic frictional forces ? How do you measure them ?

25. When is a body said to be in equilibrium ?

26. Does the apparent weight of a passenger in an elevator change when the elevator is moving upward or downward with constant velocity ?

27. Does the apparent weight decrease or increase when the elevator is (a) accelerating upward (b) accelerating downward.

28. Where will an object of mass 10 kg have the greatest weight; Earth, Moon or Jupiter.

29. What happens when a net force acts on an object ?

30. If no net force acts on an object, what is necessarily zero (a) Velocity (b) Acceleration

31. The acceleration of an object acted upon by a force is directly proportional to the applied force and inversely proportional to the mass.

32. Based on Newton’s 2nd law, if mass of an object doubles, for the same applied force, what happens to its acceleration.

33. For the same mass if the force is doubled, what happens to its acceleration ?

34. Is the force of gravity the same for 1 kg and 10 kg objects ? Is g the same for both.

35. A cannonball is fired. Are the force acting on the ball and the cannon the same. Are

the magnitudes of their acceleration equal.

36. If the Earth’s gravitational pull on a falling apple is the Action force, what is the Reaction force ? Are they equal ?

37. Do Action and Reaction force act on the same object.

Ch. 6

38. For a given force F and displacement d, when is work done maximum ? When is it zero ?

39. What are the 3 situations when work done on an object is zero ?

40. What are the units for energy and work. Define P.E and K.E.

41. What happens to an object when work is done on it ?

42. What is the work done by gravity equal to ?

43. What are conservative forces and non-conservative forces ? What does the work done by conservative force depend on ? Give examples of both kinds of forces.

44. If no friction is present is the P.E of a falling object fully converted to K.E ?

45. If the total energy of an object of a falling object was 100 J just before it was dropped, and it had a K.E of 80 J just before it hit the ground, what was the work done by air resistance on it ?

46. What is the work energy theorem ? How do you use it to calculate the change in K.E. of an object ?

47. What is the work energy theorem when you have both conservative and non-conservative forces acting on an object ?

48. Is the final velocity of a falling object increased or decreased when air resistance is present.

49. Define Power. What are its units ?

50. If you work faster, do you increase or decrease power ?

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