Download 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 airresistance. 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. Is 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. 5
1)
What is uniform circular motion ?
2)
Define period, velocity, centripetal acceleration and force. Give mathematical
expressions.
3)
In a rotating object, where are aC and FC maximum and where are they minimum.
4)
What is the direction of centripetal acceleration and what is the direction of tangential
velocity, for a body in uniform circular motion ?
5)
What is banking of curves ? What provides the centripetal force to keep a car moving
along a curve ? Give mathematical expressions.
What is free fall ? Why do astronauts in orbit around the earth experience apparent
weightlessness?