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1.7 Energy, work and power

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Question 59

A student performs four different physical activities. In which of these activities is the greatest amount of work done? (Take the acceleration due to gravity, g=10 m s−2g = 10\text{ m s}^{-2}g=10 m s−2.)

A

lifting a 2.5 kg2.5\text{ kg}2.5 kg mass vertically through a height of 2.0 m2.0\text{ m}2.0 m

B

pushing an object through a horizontal distance of 15 m15\text{ m}15 m against a frictional force of 6 N6\text{ N}6 N

C

lifting a 4.0 kg4.0\text{ kg}4.0 kg mass vertically through a height of 1.5 m1.5\text{ m}1.5 m

D

pulling an object through a horizontal distance of 10 m10\text{ m}10 m against a resistive force of 7 N7\text{ N}7 N

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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