Momentum Test Review
The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
All the above choices are valid
A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which if the following conditions applies to the first ball?
Comes to rest
A valid unit for momentum is which of the following?
Kg•m/s
The units of impulse are equivalent to:
Kg•m/s
In a two-body collision, if the momentum of the system is conserved, then which of the following best describes the kinetic energy after the collision?
May also be conserved
The impulse experienced by a body is equivalent to its change in:
Momentum
If a two-body collision is not head-on, then we may always assume that:
Momentum is conserved
In a two body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?
Must also be conserved
Two masses collide and stick together. Before the collision one of the masses was at rest. Is there a situation in which the the kinetic energy is conserved in such a collision?
No, kinetic energy is always lost in such a collision.
Two particles collide, one of them initially being at rest. Is it possible for both particles to be at rest after the collision?
No.
When a collision is perfectly inelastic, then:
The participants stick together
In an automobile collision, how does an airbag lessen the blow to the passenger? Assume as a result of the collision, the passenger stops.
The stopping impulse is the same for either the hard objects or the airbag. The airbag decreases the average force on the passenger.
A moderate force will break an egg. However, an egg dropped in the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:
The time interval for stopping is greater
Two masses m1 and m2, with m1=3 m2, undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision?
v
