Photo AI

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

Question icon

Question 3

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

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 sam... 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.

96%

114 rated

Answer

The correct answer is C. 1 watt, W, is defined as 1 joule per second (J/s).

Step 2

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

99%

104 rated

Answer

Work done (W) is calculated using the formula: W=FimesdW = F imes d where:

  • F = force (1400 N)
  • d = distance (6.0 m)

Thus, the work done is: W=1400extNimes6.0extm=8400extJW = 1400 ext{ N} imes 6.0 ext{ m} = 8400 ext{ J}

Therefore, the work done by the driving force is 8400 J.

Step 3

(ii) Calculate the kinetic energy of the car.

96%

101 rated

Answer

The kinetic energy (KE) of an object is calculated using the formula: KE=12mv2KE = \frac{1}{2} m v^2 where:

  • m = mass (1200 kg)
  • v = velocity (20 m/s)

Thus, the kinetic energy is: KE=12×1200extkg×(20extm/s)2=12×1200×400=240000extJKE = \frac{1}{2} \times 1200 ext{ kg} \times (20 ext{ m/s})^2 = \frac{1}{2} \times 1200 \times 400 = 240000 ext{ J}

Therefore, the kinetic energy of the car is 240000 J.

Join the GCSE students using SimpleStudy...

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

;