Name: ___________________________________    Date: ______________



1.
A stone is dropped from a cliff. The graph (carefully note the axes) that best represents its motion while it falls is:
A.
I
B.
II
C.
III
D.
IV
E.
V


2.
A ball is in free fall. Its acceleration is:
A.
downward during both ascent and descent
B.
downward during ascent and upward during descent
C.
upward during ascent and downward during descent
D.
upward during both ascent and descent
E.
downward at all times except at the very top, when it is zero


3.
A boat is able to move through still water at 20 m/s. It makes a round trip to a town 3.0 km upstream. If the river flows at 5 m/s, the time required for this round trip is:
A.
120 s
B.
150 s
C.
200 s
D.
300 s
E.
320 s


4.
An object is shot from the back of a railroad flatcar moving at 40 km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the flatcar. The object falls:
A.
in front of the flatcar
B.
behind the flatcar
C.
on the truck
D.
either behind or in front of the flatcar, depending on the initial speed of the object
E.
to the side of the flatcar


5.
An example of an inertial reference frame is:
A.
any reference frame that is not accelerating
B.
a frame attached to a particle on which there are no forces
C.
any reference frame that is at rest
D.
a reference frame attached to the center of the universe
E.
a reference frame attached to the Earth


6.
When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s2. When the same force is applied to another object its acceleration is one-fifth as much. The mass of the object is:
A.
0.2 kg
B.
0.5 kg
C.
1.0 kg
D.
5.0 kg
E.
10 kg


7.
A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:
A.
1
B.
1/12
C.
1/13
D.
1/25
E.
13/25


8.
Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The net force acting on book Y is:
A.
4 N down
B.
5 N up
C.
9 N down
D.
zero
E.
none of these


9.
A 40-N crate rests on a rough horizontal floor. A 12-N horizonatl force is then applied to it. If the coefficients of friction are μ s = 0.5 and μ k = 0.4, the magnitude of the frictional force on the crate is:
A.
8 N
B.
12 N
C.
16 N
D.
20 N
E.
40 Nb


10.
A person riding a Ferris wheel is strapped into her seat by a seat belt. The wheel is spun so that the centripetal acceleration is g. Select the correct combination of forces that act on her when she is at the top. In the table, Fg = force of gravity, down; Fb = seat belt force, down; and Fs = seat force, up.
A.
Fg = 0, Fb = mg, Fs = 0
B.
Fg = mg, Fb = 0, Fs = 0
C.
Fg = 0, Fb = 0, Fs = mg
D.
Fg = mg, Fb = mg, Fs = 0
E.
Fg = mg, Fb = 0, Fs = mg


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