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CAIE A-Level Physics AS 3 Dynamics Questions

Practise applying Newton’s laws, momentum and force diagrams to mechanics, and analysing friction, drag, gravity and terminal velocity.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Apply Newtonian mechanics to relate mass, resultant force, momentum, weight and acceleration in a stated system.
  • Use force diagrams, momentum change and vector directions to solve or explain mechanics interactions.
  • Analyse friction, drag, gravitational motion and terminal velocity through changing resultant force and acceleration.

Covered syllabus points

3.1 Momentum and Newton’s laws of motion3.2 Non-uniform motion3.3 Linear momentum and its conservation

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 box in air slides with increasing speed down a rough slope from point P to point Q.

Figure for Question 2 — CAIE A-Level Physics AS

The slope surface exerts a constant frictional force on the box.
As the box moves from P to Q, there are changes to the magnitudes of its acceleration and the total resistive force acting on it.

Which row describes the changes?

magnitude of

acceleration

magnitude of

total resistive

force

increases

decreases

decreases

decreases

increases

increases

decreases

increases

Question 3

[Maximum number: 1]

What is a statement of the principle of conservation of momentum?

A

A force is equal to the rate of change of momentum of the object upon which it acts.

B

In a perfectly elastic collision, the relative momentum of the objects before impact is equal to their relative momentum after impact.

C

The momentum of an object is the product of the mass of the object and its velocity.

D

The total momentum of a system of interacting objects remains constant, providing no resultant external force acts on the system.

Question 4

[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 4 — 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}

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