WorksheetsAP Physics Conceptual Pretest
Total questions: 15
Worksheet time: 1hrs 15mins
Name
Class
Date
1.
a)
A
b)
B
c)
C
d)
D
2.
a)
A
b)
B
c)
C
d)
D
3.
a)
A
b)
B
c)
C
d)
D
4.
a)
A
b)
B
c)
C
d)
D
5.
a)
A
b)
B
c)
C
d)
D
6.
a)
A
b)
B
c)
C
d)
D
7.
A solid metal bar is at rest on a horizontal frictionless surface. It is free to rotate about a vertical axis at the left end. The figures show forces of different magnitudes that are exerted on the bar at different locations. In which case does the bar's angular speed about the axis increase at the fastest rate?
a)
A
b)
B
c)
C
d)
D
8.
a)
It is at a maximum when the pendulum is at its lowest point
b)
It is at a maximum when the pendulum is at its maximum height h
c)
It is constant throughout the pendulum's motion
d)
It is at a minimum when the pendulum is somewhere between its lowest and highest positions
9.
Tiny drops of oil that have different amounts of electric charge produced by a random process are sprayed into a region between a positively and a negatively charged plate. The charge on each drop is determined by analyzing the effect of the electric force on the drop's motion. Two graphs of the number of drops as a function of the charge on eacd drop, where e is the charge of an electron. Which graph shows the likely results after repeating the experiment many times and why?
a)
Graph 1, because it shows peaks with approximately the same amplitude
b)
Graph 1, because it shows that within experimental error charge only exists in multiples of e
c)
Graph 2, because it shows a peak value at the charge of an electron
d)
Graph 2, because it shows a narrower range of measurement error
10.
A stone disk is sliding on a frictionless ice to the west with speed v. As the disk slides by, a child uses a rubber mallet to hit the disk at point X, exerting a force directly toward the center of the disk. The child hits point X every half second for about 10 s, changing the trajectory of the disk but not causing it to rotate. Which of the following most closely approximates the path of the disk while the child is hitting it?
a)
A
b)
B
c)
C
d)
D
11.
a)
FB = FA = Fg
b)
(FB = FA) < Fg
c)
FB < (FA = Fg)
d)
Fg < FB < FA
12.
A system consists of a disk rotating on a frictionless axle and a piece of clay moving toward it. The outside edge of the disk is moving at a linear speed v, and the clay is moving at a speed of v/2. The clay sticks to the outside edge of the disk. How does the angular momentum of the system after the clay sticks compare to the angular momentum of the system before the clay sticks, and what is an explanation for the comparison?
a)
It is the same because there is no external torque acting on the system
b)
It is greater because the rotating mass increases, which increase the rotational intertia
c)
It is less because the speed of the disk decreases when the clay sticks to it
d)
It is less because the angular momentum of the clay opposes that of the disk
13.
Each of the figures above shows a tractor attached to an object. The tractor exerts the same constant force F on each object in each case. Which of the following is a true statement about an object and the relative magnitude of the force exerted by the object on the tractor?
a)
The magnitude of the force exerted by the truck on the tractor is greatest, because the resulting motion is in direction opposite the tractor's pull
b)
The magnitude of the force exerted by the boulder on the tractor is least, because no motion results
c)
The magnitude of the force exerted by the wagon on the tractor is least, because the resulting motion is in the direction of the tractor's pull
d)
The magnitude of the force exerted by each object on the tractor is equal, because tractor exerts an equal force on the object
14.
A student stands at one end of a raft floating in a pool with equally spaced marks along the bottom. The student and the raft have the same mass. The student walks to the opposite end of the raft. Which of the following best shows the final locations of the raft and student relative to the marks at the bottom of the pool? Assume there is no drag force between raft and the water.
a)
A
b)
B
c)
C
d)
D
15.
a)
A
b)
B
c)
C
d)
D
100 %
