MT2-1
A crane is raising a car with a mass m at a constant speed. As the
car moves a height H, how much work is done by the crane on the
car?
a)  +mgH
b)  -mgH
c)  No work is done on the car by the crane.
MT2-2
A crane is raising a car with a mass m at a constant speed. As the
car moves a height H, what is the total work done on the car?
a)  +mgH
b)  -mgH
c)  No total work is done on the car.
MT2-3
Block 1 and Block 2 with masses m1 and m2, respectively, are connected by an inextensible
massless string, which goes over a frictionless massless pulley as shown. As Block 2 falls a
height of h, what is the change in gravitational potential energy of the blocks-Earth system?
a) 
b) 
c) 
d) 
e) 
-(m1 + m2)gh
-m1gh
-m2gh
(m1 - m2)gh
(m2 - m1)gh
MT2-4
A block is initially moving on a frictionless surface with a velocity v0 to the right. Then at x = 0, it encounters a
relaxed spring, and a rough surface as shown. The block compresses the spring a maximum distance when it
momentarily stops. Compare the absolute values of the change in kinetic energy of the block, |ΔKE|, to the
change in elastic potential energy of the spring, |ΔPEs|.
a) 
b) 
c) 
|ΔKE| = |ΔPEs|
|ΔKE| > |ΔPEs|
|ΔKE| < |ΔPEs|
MT2-5
A block sliding on a horizontal surface with initial speed v0 enters and leaves a
rough region. Its mechanical energy changes by ΔE on the rough region. If the same
block enters the rough region with a speed 2v0 and leaves the rough region
following the same path, what is the mechanical energy change in this case?
a) 
b) 
c) 
ΔE
2ΔE
½ΔE
MT2-6
A ball with a mass m is initially moving with a speed v. Upon hitting a wall,
it reverses the direction and moves at the same speed v. What is the
magnitude of the impulse imparted by the wall on the ball?
a) 
b) 
c) 
mv
2mv
0
MT2-7
A block of mass m1 moving with a speed v collides elastically with another block of
mass m2 (m2 > m1) initially at rest. Compare the kinetic energy of m2 after the
collision, KE2f, to the kinetic energy of m1 before the collision, KE1i.
a) 
b) 
c) 
KE2f = KE1i
KE2f < KE1i
KE2f > KE1i
MT2-8
Block 1 is moving in the positive x-direction toward initially stationary Block
2 and collides elastically. If both blocks move the the positive x-direction
after the collision, compare the speeds of Block 1 and Block 2.
a) 
b) 
c) 
Block 1 is faster.
Block 2 is faster.
Block 1 and Block 2 move at the same speed.
MT2-9
A ladder with a weight W and length L is leaning against a frictionless wall on a rough surface,
making an angle θ from the horizontal. What is the torque that the weight of the ladder exert on
the ladder about the bottom of the ladder?
a)  WL cosθ
2
WL sin θ
b) 
2
c)  WL sin θ
d)  WL cosθ