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2.4 – Momentum and impulse - IB Questionbank | RevisionDojo

Practice 2.4 – Momentum and impulse with authentic IB Physics exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like mechanics, thermodynamics, and waves. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.

Paper

Level

Question 1

SLPaper 2

This question is about the motion of a bicycle. A cyclist is moving up a slope that is at an angle of 19° to the horizontal. The mass of the cyclist and the bicycle is 85 kg.

Calculate the component of the weight of the cyclist and bicycle parallel to the slope.

[2]

Calculate the normal reaction force on the bicycle from the slope.

[1]

At the bottom of the slope the cyclist has a speed of 5.5 m s⁻¹. The cyclist stops pedalling and applies the brakes which provide an additional decelerating force of 250 N. Determine the distance taken for the cyclist to stop. Assume air resistance is negligible and that there are no other frictional forces.

[4]

Question 2

SLPaper 1A

An object of mass $2m$ moving at velocity $3v$ collides with a stationary object of mass $4m$ . The objects stick together after the collision. What is the final speed and the change in total kinetic energy immediately after the collision?

	Final speed	Change in total kinetic energy
A.	$v$	$3mv^2$
B.	$v$	$6mv^2$
C.	$2v$	$3mv^2$
D.	$2v$	$6mv^2$

Question 3

HLPaper 1A

A girl is standing on a moving skateboard. She pushes backwards on the ground at intervals as shown on the graph.

How much kinetic energy is gained by the girl during the period represented on the graph? Frictional forces are negligible.

Question 4

HLPaper 1A

Two identical spheres, each of mass $m$ and speed $v$ , travel towards each other on a frictionless surface in a vacuum.

The spheres undergo a head-on elastic collision.

Which statement correctly describes the spheres after the collision?

Question 5

HLPaper 1A

A varying force acts upon an object. The graph below shows how the force varies with time.

The impulse received by the object is

Question 6

HLPaper 1A

A ball of mass 0.2 kg strikes a force sensor and sticks to it. Just before impact the ball is travelling horizontally at a speed of $4.0 \mathrm{~m} \mathrm{~s}^{-1}$ . The graph shows the variation with time $t$ of the force $F$ recorded by the sensor.

What is $F_{\text {max}}$ ?

Question 7

HLPaper 1A

A stopper of mass 8 g leaves the opening of a container that contains pressurized gas.

The stopper accelerates from rest for a time of 16 ms and leaves the container at a speed of $20 \mathrm{m} \mathrm{s}^{-1}$ . What is the order of magnitude of the force acting on the stopper?

Question 8

HLPaper 1A

A cyclist accelerates in a straight line. At one instant, when the cyclist is exerting a forward force of 40 N , the air resistance acting on the cyclist is 10 N .

What is the rate of change of momentum of the cyclist at this instant?

Question 9

SLPaper 1A

A moving system undergoes an explosion. What is correct for the momentum of the system and the kinetic energy of the system when they are compared immediately before and after the explosion?

Momentum	Kinetic energy
conserved	increased
conserved	conserved
increased	conserved
increased	increased

Question 10

HLPaper 1A

A toy car of mass 0.15 kg accelerates from a speed of $10 \mathrm{~cm} \mathrm{~s}^{-1}$ to a speed of $15 \mathrm{~cm} \mathrm{~s}^{-1}$ . What is the impulse acting on the car?

2.4 – Momentum and impulse Questionbank