IGCSE Momentum

What are possible units of momentum

• N m

• kg m/s

• N s

• N/s

A 10 kg cannonball is travelling at 50 m/s. What is its momentum?

• 5 kg m/s

• 500 kg m/s

• 5000 kg m/s

• 50000 kg m/s

What is the change in momentum of a 1200 kg car that accelerates from 5 m/s to 10 m/s?

• 6000 kg m/s

• 12000 kg m/s

• 240 kg m/s

• 120 kg m/s

During a serve, a tennis ball with a mass of 100 g is accelerated from 0 m/s to 50 m/s . If the tennis racket is in contact with the ball for 0.1 s, what is the average force exerted on the ball?

• 50000 N

• 0.5 N

• 500 N

• 50 N

A baseball, with a mass of 150 g travels towards the batman at 50 m/s. The batsman hits the ball in the opposite direction, also at 50 m/s. The bat is in contact with the ball for 0.015 seconds. Calculate the force exerted on the ball.

• 0 N

• 1000000 N

• 1000 N

• 0.225 N

Complete the paragraph with the correct words:

An airbag decreases the risk of injury to a driver or passenger by ........................ the time taken for the person's head to stop, therefore .......................... the rate of change of momentum. This .................... the force on the head.

• decreases; increases; decreases

• increases; increases; decreases

• increases; decreases; decreases

• increases; decreases; increases

Complete the paragraph:

A baseball player will move their hands back when they catch the ball. This ........................ the time taken for the ball to stop, which .......................... the rate of change of momentum of the ball. This ........................... the force on the player's hands.

• increases; decreases; decreases

• increases; increases; decreases

• decreases; increases; decreases

• decreases; decreases; decreases

A rollerskating granny skates towards and picks up her grandson, as shown in the diagram. Calculate the their speed after the collision.

• 3 m/s

• 12 m/s

• 6 m/s

• 4 m/s

A truck crashes into a stationary car as shown in the diagram. Calculate the velocity of the truck after the collision.

• 6 m/s

• 5 m/s

• 4 m/s

• 3 m/s

A rifle fires a bullet with a mass of 0.010 kg at a velocity of 300 m/s. Calculate the velocity with which the rifle recoils (moves backwards)

• 12 m/s

• 0.75 m/s

• $-$ 0.75 m/s

• $-$ 12 m/s