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Stopping Distance Worksheet Name: ________ The stopping distance is _____________________________________ ____________________________________________________________________________________ 1. Here are some car speeds and the distance it takes for a car to stop when it is travelling at this speed, e.g., at a speed of 20 kilometres per hour it takes a car 13 metres to stop when it brakes. Speed (kilometres per hour) 20 40 60 80 100 Stopping distance (metres) 13 30 55 80 110 a) Using the data in the table complete the graph below. The first point is done for you. Remember to plot using crosses and not dots. Car Speed and Stopping Distance b) Complete the sentence about stopping distance. The faster a car is going the _______________________________________________ c) i) If the road the car was travelling on was wet the stopping distance would (circle one) decrease. ii) stay the same. increase. Explain your answer to i). _____________________________________________________________________ 2. This question is about stopping a car. Remember that a car travels some way before the driver manages to put on the brakes. This is called the thinking distance or reaction distance. The car then goes even further while the brakes bring the car to a halt. This is called the braking distance. The table gives some information about the thinking and braking distances for the same car at different speeds. Speed in kilometres per hour (km/h) Thinking distance in metres (m) Braking distance in metres (m) 45 9 14 80 16 35 105 21 75 a What is the total stopping distance of a car travelling at 45 km/h? ____________ b A child runs into the road 45 m in front of a car travelling at 80 km/h. Will the car hit the child? Explain how you know. ___________________________________________________________________ ___________________________________________________________________ c The driver is very tired. How and why will this affect the stopping distance? ___________________________________________________________________ ___________________________________________________________________ d Name one problem, other than speed, that will affect the braking distance and say why it will affect it. ___________________________________________________________________ ___________________________________________________________________ e Give one thing, other than speed or tiredness, that will increase a driver’s thinking distance ___________________________________________________________________ ___________________________________________________________________ Stopping Distance Answers 20 marks Stopping distance = definition from Textbook page 113 2 marks = the distance it takes your car to stop from when you first see a hazard. This is your reaction distance added to the braking distance Qu 1: Answers a) 2 marks all points correctly plotted 1 mark one mistake made Should plot crosses and not dots as on this graph - 1 mark Speed of car (kilometres per hour) b) c) i) ii) Smooth curve -1 mark The greater the stopping distance. 1 mark Increase Any answer that indicates less friction between the car/tyre and the road, e.g., it would be more slippery. 1 mark 1 mark Total: 8 marks Qu 2 Answer a 9 + 14 = 23 m The car will hit the child because the total stopping distance at 80 km/h (16 + 35 = 51 m) is greater than 45 m. Tiredness will increase the stopping distance because the thinking distance is increased / gets longer. Any one problem that could affect braking distance, for example: ice on road, water on road, worn tyres, faulty brakes. Accept equivalent answers. One additional factor that affects thinking distance, for example: The driver drinking alcohol, taking drugs. Accept equivalent answers. b c d e Mark Total 1 1 2 1 1 2 2 10