The Highway Code gives this information about the stopping distance of a car. speed = 30 miles per hour thinking distance = 9 m braking distance = 14 m a) (i) What is the stopping distance? Put a cross (✗) in the box next to your answer. A 5 m B 9 m C 14 m D 23 m (ii) Complete the sentence by putting a cross (✗) in the box next to your answer. The driver’s thinking distance is most likely to increase when. A the driver is tired B there is ice on the road C the car is heavier D the car moves at a slower speed b) A car has a mass of 800 kg. It has a velocity of 3.0 m/s. Calculate the momentum of the car. momentum of car = .......................... kg m/s c) (i) The braking force on another car is 600 N. The force acts for a distance of 15 m. Calculate the work done by the braking force. work done by braking force = .......................... (ii) Complete the sentence by putting a cross (✗) in the box next to your answer. The work done by the brakes during braking is equal to. A the energy transferred B the stopping distance C the acceleration D the thinking distance plus braking distance

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The Highway Code gives this information about the stopping distance of a car - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Question 1

The Highway Code gives this information about the stopping distance of a car. speed = 30 miles per hour thinking distance = 9 m braking distance = 14 m a) (i) Wha... show full transcript

Worked Solution & Example Answer:The Highway Code gives this information about the stopping distance of a car - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Step 1

What is the stopping distance?

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Answer

The stopping distance is the total distance a vehicle travels while a driver reacts and then applies the brakes. It is the sum of the thinking distance and the braking distance. Given:

Thinking distance = 9 m
Braking distance = 14 m

Thus, the stopping distance can be calculated as:

ext{Stopping Distance} = ext{Thinking Distance} + ext{Braking Distance} = 9 ext{ m} + 14 ext{ m} = 23 ext{ m}

Therefore, the correct option is D 23 m.

Step 2

Complete the sentence

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Answer

The driver’s thinking distance is most likely to increase when:

A (the driver is tired) – Correct, because tiredness can impair reaction time.
B (there is ice on the road) – Incorrect, as this affects braking distance, not thinking distance.
C (the car is heavier) – Incorrect, as this is not a direct factor affecting thinking distance.
D (the car moves at a slower speed) – Incorrect, as slower speeds generally reduce thinking distance.

Thus, the correct option is A.

Step 3

Calculate the momentum of the car.

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Answer

Momentum is defined as the product of mass and velocity. It can be calculated using the formula:

ext{Momentum} = ext{Mass} imes ext{Velocity}

Given:

Mass = 800 kg
Velocity = 3.0 m/s

So,

ext{Momentum} = 800 ext{ kg} imes 3.0 ext{ m/s} = 2400 ext{ kg m/s}

Step 4

Calculate the work done by the braking force.

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Answer

Work done by a force is calculated using the formula:

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

Given:

Force = 600 N
Distance = 15 m

Thus,

ext{Work} = 600 ext{ N} imes 15 ext{ m} = 9000 ext{ J}

Step 5

Complete the sentence about work done by the brakes

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Answer

The work done by the brakes during braking is equal to:

A (the energy transferred) – Correct, as work done is a measure of energy transfer.
B (the stopping distance) – Incorrect; it relates but is not equal.
C (the acceleration) – Incorrect; acceleration is not directly related.
D (the thinking distance plus braking distance) – Incorrect; this sums distances, not work done.

Thus, the correct option is A.

The Highway Code gives this information about the stopping distance of a car - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Worked Solution & Example Answer:The Highway Code gives this information about the stopping distance of a car - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

What is the stopping distance?

Complete the sentence

Calculate the momentum of the car.

Calculate the work done by the braking force.

Complete the sentence about work done by the brakes

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