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CAIE A-Level Physics 3.2.1 Frictional and Viscous Drag Forces

Practise describing friction, viscous drag and air resistance qualitatively, including direction, speed dependence and force-diagram effects.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Explain qualitatively how frictional forces oppose relative motion between surfaces.
  • Describe how viscous/drag force and air resistance change as speed increases using the simple qualitative drag model.
  • Identify the direction and effect of resistive forces in a stated motion without introducing unsupported coefficients.

3.2.1—Frictional forces and viscous/drag forces including air resistance (no question 1

[Maximum number: 1]

The cylinder in (b) is released from the string at time t=4.0 st=4.0 \mathrm{~s}. The cylinder falls, from rest, vertically downwards through the water. Assume that the upthrust acting on the cylinder remains constant as it falls.

State the name of the force that acts on the cylinder when it is moving and does not act on the cylinder when it is stationary.

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