Momentum

Is momentum conserved in both elastic and inelastic collisions?

• Yes

• No

The SI unit for momentum is:

• kg^.m/s

• m/s^.N

• N^.kg

• N^.m/s

In elastic collisions kinetic energy is conserved.

• True

• False

A toy car of mass 2kg is travelling at a velocity of 15 m/s what is its momentum?

• 15 N. s

• 7.5 kg. m/s

• 30 kg. m/s

• 10 kg. m/s

The longer the time taken for the momentum of an object to change the smaller the impact force:

• True

• False

The green ball has a mass of 2.0 kg and is moving at 4.0 m/s prior to colliding with the stationary purple ball.

After the collision, both balls are moving in a forward direction. If the green ball is still moving forward at 1.5 m/s, calculate the velocity of the purple ball. hint use conservation of momentum equation

• 1.0 m/s

• 1.7 m/s

• 3 m/s

• 5 m/s