Momentum and Its Conservation
Practice Test
1.
A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the change in the object's velocity?
a.
4.33 m/s
b.
3.2 m/s
c.
1.2 m/s
d.
6.3 m/s
Hint
2.
FΔt = mΔv
is the equation for __________.
a.
linear momentum
b.
net force
c.
impulse-momentum
d.
angular momentum
Hint
3.
Before a collision, a 35-kg object is moving at +10.0 m/s. Find the impulse that acted on the object if, after the collision, it moves at +8.0 m/s.
a.
-7.0×10
2
kg·m/s
b.
7.0×10
1
kg·m/s
c.
-2.8×10
2
kg·m/s
d.
-7.0×10
1
kg·m/s
Hint
4.
A 4.75-g bullet is fired with a velocity of 120.0 m/s toward a 20.0-kg stationary solid block resting on a frictionless surface. What is the change in momentum of the bullet if it is embedded in the block?
a.
-0.57 kg·m/s
b.
5.7 kg·m/s
c.
-1.20×10
3
kg·m/s
d.
1.20×10
3
kg·m/s
Hint
