Momentum and Its Conservation
Practice Test
1.
The product of the average force and the time interval over which it acts is the __________.
a.
acceleration
b.
linear momentum
c.
impulse
d.
velocity
Hint
2.
Which one of the changes to the situation in Figure 9-2 listed below would require the airbag to exert a larger average force on the passenger?
a.
The initial speed of the passenger is decreased.
b.
The passenger's weight is decreased.
c.
The time required to stop the passenger is lengthened.
d.
The time required to stop the passenger is shortened.
Hint
3.
In Figure 9-6, if
v
C
is 1 m/s,
v
D
is 7 m/s, and the mass of each ball is 2 kg, how would the magnitudes of the forces exerted by each ball on the other during the collision compare?
a.
They do not exert forces on each other.
b.
The magnitudes of the forces would be equal.
c.
The magnitude of the force of C on D would be greater than the magnitude of the force of D on C.
d.
The magnitude of the force of D on C would be greater than the magnitude of the force of C on D.
Hint
4.
The law of conservation of momentum states that __________.
a.
the momentum of any system does not change
b.
momentum is neither created nor destroyed
c.
the momentum of any closed system does not change
d.
the momentum of any closed system with no net external force does not change
Hint
