CAIE IGCSE Physics Solid Friction

Practise identifying friction between contacting surfaces, explaining how it opposes motion and how reduced tyre-road or wheel-rail friction increases stopping distance.

Exam points

identify solid friction as a contact force opposing relative motion between surfaces
explain that wet conditions reduce available friction and therefore increase braking distance
include friction with air resistance when naming forces opposing a road vehicle's driving force

[Maximum number: 1]

A car travels on a dry road. The driver presses the brakes. The car travels a distance before it comes to rest. This distance is called the braking distance.

State and explain how the braking distance changes when the road is wet.

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1.5.1.6—Solid friction as the force between question 1