The power of a car engine is measured in watts, W. Complete the following sentence by putting a cross (X) in the box next to your answer. 1 watt, W, is the same as A 1 joule per metre, J/m B 1 newton per second, N/s C 1 joule per second, J/s D 1 newton metre, Nm A car engine produces an average driving force of 1400N. The car travels 6.0m in the direction of the force. (i) Calculate the work done by the driving force over this distance. (ii) The car has a mass of 1200kg and travels at a velocity of 20m/s. Calculate the kinetic energy of the car.

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The power of a car engine is measured in watts, W - Edexcel - GCSE Physics - Question 3 - 2018 - Paper 1

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The power of a car engine is measured in watts, W. Complete the following sentence by putting a cross (X) in the box next to your answer. 1 watt, W, is the same as ... show full transcript

Worked Solution & Example Answer:The power of a car engine is measured in watts, W - Edexcel - GCSE Physics - Question 3 - 2018 - Paper 1

Step 1

1 watt, W, is the same as

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Answer

The correct answer is C: 1 joule per second, J/s. Power is defined as the rate of doing work, which is measured in joules per second.

Step 2

(i) Calculate the work done by the driving force over this distance.

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Answer

Work done is calculated using the formula: $W = F imes d$ where:

$W$ is the work done,
$F$ is the force applied (1400 N), and
$d$ is the distance moved (6.0 m).

Substituting the values: $W = 1400 ext{ N} imes 6.0 ext{ m} = 8400 ext{ J}$ Therefore, the work done is 8400 J.

Step 3

(ii) Calculate the kinetic energy of the car.

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Answer

The kinetic energy (KE) of an object can be calculated using the formula: $KE = \frac{1}{2} mv^2$ where:

$m$ is the mass of the object (1200 kg), and
$v$ is the velocity of the object (20 m/s).

Substituting the values: $KE = \frac{1}{2} \times 1200 ext{ kg} \times (20 ext{ m/s})^2$ $KE = \frac{1}{2} \times 1200 \times 400 = 240000 ext{ J}$ Thus, the kinetic energy of the car is 240000 J.

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The power of a car engine is measured in watts, W - Edexcel - GCSE Physics - Question 3 - 2018 - Paper 1

Worked Solution & Example Answer:The power of a car engine is measured in watts, W - Edexcel - GCSE Physics - Question 3 - 2018 - Paper 1

1 watt, W, is the same as

(i) Calculate the work done by the driving force over this distance.

(ii) Calculate the kinetic energy of the car.

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