Work, Energy, Power, Momentum, Conservation Laws

1. An object moves 25m with a constant speed v, as shown in the figure below while

a force F = 20N is exerted on the object. What is the work done by the force F?

a) -500J
b) -250J
c) 0J
d) 250J
e) 500J

2. The graph above plots the force exerted on a block of mass m against the
displacement of the block. What is the work done by the force in moving the box
from d = 0 to d = 6?

a) 2J
b) 5J
c) 8J
d) 10J
e) 15J

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3. Two forces push simultaneously a stationary 2kg box in opposite directions: F

1

acts

from left to right and does 150J of work on the box while F

2

acts from right to left

and does 50J of work on the box. What is the velocity of the box after the work has
been done on it?
a) 5m/s
b) 7m/s
c) 10m/s
d) 12m/s
e) 15m/s


4. A soccer ball is kicked vertically from the ground level with a speed of 20m/s. At
what height is the gravitational potential energy of the ball maximum?
a) 5m
b) 10m
c) 15m
d) 20m
e) 25m


5. Two billiard balls move on a frictionless surface with speeds v and v/2, as shown in
the figure below. Both of these balls have the same mass, and the collision is
perfectly elastic. What is the sum of the velocities of the two balls after the collision?

a) v/2
b) v
c) 3v/2
d) 2v
e) 5v/2


6. A shopping cart weighing 12kg moves with a speed of 5m/s. A 3kg food container
falls in the shopping cart. What is the speed of the shopping cart after the container
fall?
a) 1m/s
b) 2m/s
c) 3m/s
d) 4m/s
e) 5m/s

Solutions:

Question #1: b
Question #2: d
Question #3: c
Question #4: d
Question #5: c
Question #6: d