Forces and motion

EasyMediumHard
123456789101112131415161718
Question 16
Easy

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]

Forces and motion Questions

  1. GCSE
  2. /Physics
  3. /Forces and motion