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1.7 Energy, work and power

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Question 390

A wooden block has a gravitational energy store equal to 85 J. When the block falls in air, it does 32 J of work against air resistance. What is the gain in kinetic energy stored in the block during this fall?

A

32 J32\text{ J}32 J

B

53 J53\text{ J}53 J

C

85 J85\text{ J}85 J

D

117 J117\text{ J}117 J

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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