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CAIE A-Level Physics 5.1.1 Work Done by a Force

Practise defining and calculating work done from the force component along displacement, interpreting positive, negative or zero work in physical situations.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • define work done as force multiplied by displacement in the direction of the force and identify when a force does positive, negative or zero work
  • calculate work done using the component of force parallel to displacement, including forces at an angle
  • interpret work done in situations with resistive forces, slopes, lifting, pressure or changing kinetic energy

5.1.1—The concept of work, and recall and use work done = force × displacement in question 1

[Maximum number: 2]

The ball in (b) leaves the toy at point A and moves vertically upwards through the air. Point B is the position of the ball when it is at maximum height h above point A , as illustrated in Fig. 3.2.

Fig. 3.2 (not to scale)

Fig. 3.2 (not to scale)

The gravitational potential energy of the ball increases by 0.60 J as it moves from A to B .

Determine the average force due to air resistance acting on the ball for its movement from A to B.
average force = N

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