Practice question

Compared with a dry surface, a wet or icy surface does what to the tyre–road friction a motorcycle depends on?

Increases it, so you can brake later
Decreases it, so braking distance grows and sudden lean or throttle becomes more likely to cause a slide
Leaves it unchanged if the tyres are new
Matters only for cars, not for two-wheelers

Answer: B — Decreases it, so braking distance grows and sudden lean or throttle becomes more likely to cause a slide

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