Evaluate the effect of various factors on thinking distance based on given data. 4.7.1.10 When a force is applied to Describe and explain 0.5 Find patterns between the Discussion questions: cont. the brakes of a vehicle, work the energy changes speed of a vehicle and the Why does a drawing done by the friction force involved in stopping a braking distance, eg what pin heat up when between the brakes and the vehicle. would be the effect of doubling rubbed across a wheel reduces the kinetic the speed on the braking Explain why vehicles surface? energy of the vehicle and the distance and why? travelling faster have Why do the rims of temperature of the brakes larger braking Explain why stopping from bicycles get hot increases. distances. high speed can cause the when going down The greater the speed of a brake pads to overheat and steep hills? vehicle the greater the the brake disks to warp. What problems are braking force needed to stop caused by brakes WS 1.5, MS 1d the vehicle in a certain overheating on (HT only) estimate the forces distance. bicycles and cars? involved in typical situations on Why are the brakes The greater the braking force a public road. for a Formula 1 car the greater the deceleration not suitable for road of the vehicle. Large use? decelerations may lead to brakes overheating and/or loss of control.
Evaluate the effect of various factors on thinking distance based on given data. 4.7.1.10 cont. When a force is applied to the brakes of a vehicle, work done by the friction force between the brakes and the wheel reduces the kinetic energy of the vehicle and the temperature of the brakes increases. The greater the speed of a vehicle the greater the braking force needed to stop the vehicle in a certain distance. The greater the braking force the greater the deceleration of the vehicle. Large decelerations may lead to brakes overheating and/or loss of control. Describe and explain the energy changes involved in stopping a vehicle. Explain why vehicles travelling faster have larger braking distances. 0.5 Find patterns between the speed of a vehicle and the braking distance, eg what would be the effect of doubling the speed on the braking distance and why? Explain why stopping from high speed can cause the brake pads to overheat and the brake disks to warp. WS 1.5, MS 1d (HT only) estimate the forces involved in typical situations on a public road. Discussion questions: Why does a drawing pin heat up when rubbed across a surface? Why do the rims of bicycles get hot when going down steep hills? What problems are caused by brakes overheating on bicycles and cars? Why are the brakes for a Formula 1 car not suitable for road use?
AQA-8465-SOW-MAI.DOCX