3 (a) 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 (b) 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.

GCSE Edexcel Physics Kinetic Energy: 3 (a) The power of a car engine

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

Question 3

3 (a) 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 sa... show full transcript

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

Step 1

Complete the following sentence by putting a cross (X) in the box next to your answer.

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Answer

1 watt, W, is the same as C. 1 joule per second, J/s. This is because power is defined as the rate at which work is done, where 1 watt equals 1 joule of energy transferred per second.

Step 2

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

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Answer

To calculate the work done (W), we use the formula:

$W = F imes d$

where:

F is the force applied (1400 N)
d is the distance traveled (6.0 m)

Thus, substituting the values:

$W = 1400 ext{ N} imes 6.0 ext{ m} = 8400 ext{ J}$

The work done by the driving force is 8400 J.

Step 3

(ii) Calculate the kinetic energy of the car.

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Answer

The formula for kinetic energy (KE) is given by:

$KE = rac{1}{2} mv^2$

where:

m is the mass of the car (1200 kg)
v is the velocity of the car (20 m/s)

Substituting the values into the formula:

$KE = rac{1}{2} imes 1200 ext{ kg} imes (20 ext{ m/s})^2$ $KE = rac{1}{2} imes 1200 ext{ kg} imes 400 ext{ m}^2/ ext{s}^2$ $KE = 240000 ext{ J}$

The kinetic energy of the car is 240000 J.

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

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

Complete the following sentence by putting a cross (X) in the box next to your answer.

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

(ii) Calculate the kinetic energy of the car.

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