The diagram shows what happens to a truck being driven at a constant speed along a flat, straight road. At A the driver spots a danger. At B the driver applies the brakes. At C the truck comes to a stop. (i) State what is happening between A and B. (ii) The brakes exert a constant force of 700 N on the truck from when they are applied until the truck comes to a stop. Calculate the work done by the brakes.

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The diagram shows what happens to a truck being driven at a constant speed along a flat, straight road - Edexcel - GCSE Physics - Question 6 - 2016 - Paper 1

Question 6

The diagram shows what happens to a truck being driven at a constant speed along a flat, straight road. At A the driver spots a danger. At B the driver applies the b... show full transcript

Worked Solution & Example Answer:The diagram shows what happens to a truck being driven at a constant speed along a flat, straight road - Edexcel - GCSE Physics - Question 6 - 2016 - Paper 1

Step 1

State what is happening between A and B.

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Answer

Between A and B, the driver is reacting to the danger by preparing to apply the brakes. This involves thinking about the situation and getting ready to stop the vehicle.

Step 2

Calculate the work done by the brakes.

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Answer

To calculate the work done by the brakes, we use the formula for work done:

ext{Work done} = ext{Force} imes ext{Distance}

Given that the force is 700 N and the total stopping distance is 19 m + 60 m = 79 m, we substitute these values into the formula:

ext{Work done} = 700 ext{ N} imes 79 ext{ m} = 55,300 ext{ J}

Thus, the work done by the brakes is 55,300 J.

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