Momentum

Select the correct equations.

• mass = momentum x velocity

• momentum = mass x velocity

• momentum = mass / velocity

• velocity = momentum / mass

• mass = velocity / momentum

The correct unit of momentum is...

• N/m

• kgm/s

• m/s²

• N

• kgm/s²

Momentum is a __________ quantity.

• scalar

• vector

In snooker, two balls of the same size and mass collide with each other. After the collision the momentum of the white ball is...

• greater than its initial momentum

• equal to its initial momentum

• less than its initial momentum

• zero

In snooker, two balls of the same size and mass collide with each other. After the collision the total momentum of both balls is...

• greater than their total initial momentum

• equal to their total initial momentum

• less than their total initial momentum

• zero

Two ice skaters approach each other, collide, and move off together as shown. What is their combined momentum before the collision?

(HINT: momentum is a vector quantity)

What is their velocity after the collision?

A car is moving east with a velocity of 20 m/s and momentum 46,000 kgm/s. Calculate the mass of the car.

A motorbike is travelling at 25 m/s and has a mass of 220 kg. Calculate the momentum of the motorbike.

A ball moves with an initial velocity of 3 m/s. It comes to rest after 4 seconds due to a constant resistive force of 0.15 N. Calculate the mass of the ball.