ConceptConceptDocsDocuments

CAIE IGCSE Physics Force in Circular Motion

Practise identifying the inward force perpendicular to circular motion and predicting how speed, radius and mass affect the force needed to maintain the path.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • draw the resultant force perpendicular to velocity and directed toward the centre of the circle
  • explain that constant speed still gives acceleration because velocity direction and momentum change
  • predict greater required force for higher speed or mass, or for a smaller circular radius

1.5.1.12—Circular motion caused by a force question 1

[Maximum number: 2]

Fig. 2.1 shows a motorcyclist accelerating along a straight horizontal section of track.

Fig. 2.1

Fig. 2.1

The motorcyclist and motorcycle have a combined mass of 240 kg .

At the end of the straight section, the track remains horizontal but bends to the right, as shown in Fig. 2.1.

When the motorcyclist reaches the bend, she travels around the bend in a circular path at a constant speed.

Explain why there must be a resultant force on the motorcyclist as she travels around the bend.

All question bank results loaded