Paper 2 H - SAMPLE SET 1 Q9
9) The stopping distance of a car is the sum of the thinking distance and the braking distance.
Table 4 shows how the thinking distance and braking distance vary with speed.
Table 4 shows how the thinking distance and braking distance vary with speed.
9.1) What is meant by the braking distance of a vehicle? [1 mark]
9.2) The data in Table 4 refers to a car in good mechanical condition driven by an alert driver.
Explain why the stopping distance of the car increases if the driver is very tired. [2 marks]
9.3) A student looks at the data in Table 4 and writes the following:
9.2) The data in Table 4 refers to a car in good mechanical condition driven by an alert driver.
Explain why the stopping distance of the car increases if the driver is very tired. [2 marks]
9.3) A student looks at the data in Table 4 and writes the following:
Explain whether the student is correct. [2 marks]
Applying the brakes with too much force can cause a car to skid.
The distance a car skids before stopping depends on the friction between the road surface and the car tyres and also the speed of the car.
Friction can be investigated by pulling a device called a ‘sled’ across a surface at constant speed.
Figure 16 shows a sled being pulled correctly and incorrectly across a surface.
The constant of friction for the surface is calculated from the value of the force pulling the sled and the weight of the sled.
Applying the brakes with too much force can cause a car to skid.
The distance a car skids before stopping depends on the friction between the road surface and the car tyres and also the speed of the car.
Friction can be investigated by pulling a device called a ‘sled’ across a surface at constant speed.
Figure 16 shows a sled being pulled correctly and incorrectly across a surface.
The constant of friction for the surface is calculated from the value of the force pulling the sled and the weight of the sled.
9.4) Why is it important that the sled is pulled at a constant speed? [1 mark]
Tick one box.
Tick one box.
9.5) If the sled is pulled at an angle to the surface the value calculated for the constant of friction would not be appropriate.
Explain why. [2 marks]
9.6) By measuring the length of the skid marks, an accident investigator determines that the distance a car travelled between the brakes being applied and stopping was 22 m.
The investigator used a sled to determine the friction. The investigator then calculated that the car decelerated at 7.2 m/s2 .
Calculate the speed of the car just before the brakes were applied.
Give your answer to two significant figures.
Use the correct equation from the Physics Equation Sheet. [3 marks]
Explain why. [2 marks]
9.6) By measuring the length of the skid marks, an accident investigator determines that the distance a car travelled between the brakes being applied and stopping was 22 m.
The investigator used a sled to determine the friction. The investigator then calculated that the car decelerated at 7.2 m/s2 .
Calculate the speed of the car just before the brakes were applied.
Give your answer to two significant figures.
Use the correct equation from the Physics Equation Sheet. [3 marks]
Distance = __________ m
(Total for Question 9 = 11 marks)