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CAIE A-Level Physics AS 3.1 Momentum and Newtons Laws of Motion Questions

Practise applying Newton’s laws, momentum and force relationships with vectors, units, free-body reasoning, graphs and action-reaction pairs.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Explain mass, force, momentum, weight and Newtonian interaction using correct scalar/vector directions, units and free-body reasoning.
  • Apply F=ma, p=mv and F=Δp/Δt to solve mechanics problems and interpret resultant forces.
  • Identify Newton’s-law force pairs and distinguish weight, mass, momentum and resistive effects in a physical system.

Covered syllabus points

3.1.1—Mass is the property of an object that resists change in motion3.1.2—F = ma and solve problems using it, understanding that acceleration and3.1.3—Linear momentum as the product of mass and velocity3.1.4—Force as rate of change of momentum3.1.5—Each of Newton’s laws of motion3.1.6—The concept of weight as the effect of a gravitational field on a mass and

Question 1

[Maximum number: 1]

Which statement about mass is correct?

A

Mass has a magnitude and a direction.

B

Mass resists changes in motion.

C

The greater the mass of an object, the greater its acceleration when falling in a vacuum.

D

The mass of an object depends on its location.

Question 2

[Maximum number: 1]

A car of mass 850 kg is travelling in a horizontal straight line. The diagram shows the two horizontal forces acting on the car in opposite directions.

Figure for Question 2 — CAIE A-Level Physics AS

One force has magnitude 1200 N , and the other force has magnitude 1600 N .
What is the magnitude of the acceleration of the car?

A

0.47 ms−20.47 \mathrm{~ms}^{-2}

B

1.4 m s−21.4 \mathrm{~m} \mathrm{~s}^{-2}

C

1.9 m s−21.9 \mathrm{~m} \mathrm{~s}^{-2}

D

3.3 m s−23.3 \mathrm{~m} \mathrm{~s}^{-2}

Question 3

[Maximum number: 1]

What is a reasonable estimate of the momentum of a family car travelling at 25 kilometres per hour?

A

1×104 kg m s−11 \times 10^{4} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}

B

1×105 kg m s−11 \times 10^{5} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}

C

1×106 kg m s−11 \times 10^{6} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}

D

1×107 kg m s−11 \times 10^{7} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}

Question 4

[Maximum number: 1]

A block is moving along a horizontal frictionless surface. A constant force F and a constant resistive force of 5.0 N act on the block as it is moving in the direction of the force F, as shown.

Figure for Question 4 — CAIE A-Level Physics AS

The graph shows the variation with time of the momentum of the block.

Figure for Question 4 — CAIE A-Level Physics AS

What is the magnitude of force F ?

A

2.0 N2.0 \mathrm{~N}

B

3.0 N3.0 \mathrm{~N}

C

5.0 N5.0 \mathrm{~N}

D

8.0 N8.0 \mathrm{~N}

Question 5

[Maximum number: 1]

Newton's third law describes two forces that are equal in magnitude and form a pair.
Which description of the two forces in such a pair is not correct?

A

They act in opposite directions.

B

They act on different objects.

C

They are the same type of force.

D

They cause an object to be in equilibrium.

Question 6

[Maximum number: 1]

What is meant by the mass and by the weight of an object on the Earth?

mass

weight

its momentum divided by its velocity

the work done in lifting it one metre

the gravitational force on it

the property that resists its acceleration

the pull of the Earth on it

its mass divided by the acceleration of free fall

the property that resists its acceleration

the pull of the Earth on it

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