Oxford AQA International A-level · Physics (9630)

Momentum: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Momentum.

10 questions26 marksFree, no account

Question 1

1 mark

Which of the following is equivalent to the rate of change of momentum?

Question 2

1 mark

A force-time graph shows the impact of a 0.50 kg ball hitting a wall. The force increases linearly from 0 to 1000 N in 0.05 s, and then decreases linearly back to 0 in another 0.05 s. If the ball was initially at rest, what is its final speed after the impact?

Question 3

1 mark

An object of mass \( m \) moving with velocity \( u \) makes a head-on perfectly elastic collision with a stationary object of mass \( 2m \). What is the velocity of the mass \( m \) immediately after the collision?

Question 4

1 mark

An object of mass 1.5 kg is moving at a constant velocity of \( 4.0\text{ m s}^{-1} \). What is the linear momentum of this object?

Question 5

1 mark

A constant resultant force of 20 N acts on an object of mass 5.0 kg for a duration of 3.0 s. If the object was initially moving at \( 4.0\text{ m s}^{-1} \) in the direction of the force, what is its final velocity?

Question 6

2 marks

State the relationship between the resultant force acting on an object and its momentum, expressed in terms of the rate of change.

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Question 7

4 marks

A rubber ball of mass 0.20 kg hits a floor at a speed of \( 8.0\text{ m s}^{-1} \) and rebounds vertically upwards at a speed of \( 6.0\text{ m s}^{-1} \). Determine the magnitude of the impulse exerted by the floor on the ball.

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Question 8

5 marks

Water from a hose hits a vertical wall at a rate of \(15 \text{ kg s}^{-1}\) with a horizontal velocity of \(12 \text{ m s}^{-1}\). If the water does not rebound but instead runs down the wall, calculate the magnitude of the force exerted by the water on the wall.

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Question 9

4 marks

A railway wagon of mass \(8000\text{ kg}\) moving at a velocity of \(3.0\text{ m s}^{-1}\) collides with a stationary wagon of mass \(12000\text{ kg}\). The two wagons couple together and move off with a common velocity \(v\).

(a) Calculate the common velocity \(v\) of the wagons after the collision.
(b) Calculate the total kinetic energy lost during the collision.

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Question 10

6 marks

A ballistic pendulum consists of a wooden block of mass \(2.5\text{ kg}\) suspended by light strings. A bullet of mass \(15\text{ g}\) is fired horizontally into the block and becomes embedded in it. The block then swings upwards so that its centre of mass rises through a vertical height of \(12\text{ cm}\).

(a) Calculate the velocity of the block and bullet immediately after the collision.
(b) Calculate the initial horizontal velocity of the bullet.

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