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Question 16

A cyclist applies the brakes to decelerate as they approach a red traffic light.

  • The bicycle and cyclist decelerate at 0.8 m/s20.8\text{ m/s}^20.8 m/s2.
  • The combined mass of the cyclist and the bicycle is 90 kg90\text{ kg}90 kg.
a.

Calculate the time taken for the velocity of the bicycle to decrease from 8.0 m/s8.0\text{ m/s}8.0 m/s to 2.0 m/s2.0\text{ m/s}2.0 m/s. Use the equation:

time taken=change in velocitydeceleration \text{time taken} = \frac{\text{change in velocity}}{\text{deceleration}} time taken=decelerationchange in velocity​
[2]
b.

Calculate the resultant braking force causing the bicycle to decelerate. Use the equation:

resultant force=mass×deceleration \text{resultant force} = \text{mass} \times \text{deceleration} resultant force=mass×deceleration
[2]
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5 Forces Questions

  1. GCSE
  2. /Physics
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