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7.1 Work done

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Question 3
F

A car of mass 1200 kg is travelling at 15 m/s.

The driver applies the brakes and the car stops in a distance of 25 m.

a.

Calculate the kinetic energy of the car before the driver applies the brakes.

[2]
b.

All of the kinetic energy of the car is transferred by the braking force.

Calculate the average braking force on the car.

[3]
c.

The brakes get hot as the car stops.

Explain why.

[2]
Markscheme

7.1 Work done Questions

  1. GCSE
  2. /Physics
  3. /7.1 Work done

44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.

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