G9 IGCSE Momentum Quiz

A ball of mass 0.50 kg falls and hits the floor at 10 m / s.

It rebounds at speed 8.0 m / s, as shown.

The collision between the ball and the floor lasts for 0.50 s.

What is the average force acting on the ball during the collision?

• 2.0 N upwards

• 2.0 N downwards

• 18 N upwards

• 18 N downwards

An object of mass 50 kg accelerates from a velocity of 2.0 m/s to a velocity of 10 m/s in the same direction.

What is the impulse provided to cause this acceleration?

• 250 N.s

• 400 N.s

• 850 N.s

• 2500 N.s

A gas molecule strikes the wall of a container. The molecule rebounds with the same speed.

What happens to the kinetic energy and what happens to the momentum of the molecule?

• Kinetic energy changes; momentum changes

• Kinetic energy changes; momentum stays the same.

• Kinetic energy stays the same; momentum changes

• Kinetic energy stays the same; momentum stays the same.

An object of mass 4.0 kg is moving with a velocity of 3.0 m/s in a straight line.

What is the momentum of the object?

• 0.75 kg m/s

• 1.3 kg m/s

• 12 kg m/s

• 24 kg m/s

Which expression gives the momentum of an object?

• mass × acceleration

• mass × gravitational field strength

• mass × velocity

• 1/2 × mass × (velocity)²

A car of mass 1000 kg travelling at 8.0 m / s collides with a lorry of mass 3000 kg that is travelling at 2.0 m /s in the same direction. After colliding, the two vehicles stick together.

What is their speed after the collision?

• 2.0 m / s

• 2.5 m / s

• 3.5 m / s

• 5.0 m / s

A visitor to a fairground throws a soft object of mass 0.12 kg at a coconut of mass 0.48 kg. The soft object stops moving when it hits the coconut.

In order to move the coconut, it must be made to move at 0.10 m/s.

What is the minimum speed with which the visitor should throw the soft object in order to move the coconut?

• 0.20 m/s

• 0.40 m/s

• 2.0 m/s

• 4.0 m/s

A bullet of mass 0.10 kg travels horizontally at a speed of 600 m/s. It strikes a stationary wooden block of mass of

1.90 kg resting on a frictionless, horizontal surface.

The bullet stays in the block.

What is the speed of the bullet and the block immediately after the impact?

• 30 m / s

• 32 m / s

• 60 m / s

• 134 m / s

A ball of mass 2.0 kg is travelling at a speed of 12m / s. It moves towards an object of mass 3.0 kg which is at rest.

The ball hits the object and sticks to it.

Which choice gives the total momentum, and the speed of both objects immediately after the collision?

• total momentum = 0 kg.m/s; speed = 4.8 m/s.

• total momentum = 0 kg.m/s; speed = 8.0 m/s.

• total momentum = 24 kg.m/s; speed = 4.8 m/s.

• total momentum = 24 kg.m/s; speed = 8.0 m/s.

The diagrams show four bodies moving in the directions shown. The only forces acting on the bodies are shown in each diagram.

Which body gains the most kinetic energy when moving a distance of 1.0 m?

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