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1.7 Energy, work and power

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Question 224

An operator uses a battery-powered lawnmower.

a.

State the type of energy store in the lawnmower's battery.

[1]
b.

The operator pushes the lawnmower along the lawn at a constant speed with a horizontal force of 16 N16\text{ N}16 N. The operator pushes the lawnmower for a distance of 5.5 m5.5\text{ m}5.5 m.

Calculate the mechanical work done by the force pushing the lawnmower.

[2]
c.

The lawnmower is used for a time of 45 s45\text{ s}45 s. The electrical energy input to the lawnmower during this time is 6300 J6300\text{ J}6300 J.

Calculate the power input to the lawnmower.

[2]
Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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