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1.7 Energy, work and power

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Question 139

A worker lifts a heavy box from the floor and places it at rest on a high shelf. She does 80 J of work against gravity.

Which option correctly describes the energy changes of the box?

A

Gravitational potential energy gained = 80 J80\text{ J}80 J; Kinetic energy gained = 0 J0\text{ J}0 J

B

Gravitational potential energy gained = 40 J40\text{ J}40 J; Kinetic energy gained = 40 J40\text{ J}40 J

C

Gravitational potential energy gained = 0 J0\text{ J}0 J; Kinetic energy gained = 80 J80\text{ J}80 J

D

Gravitational potential energy gained = 72 J72\text{ J}72 J; Kinetic energy gained = 8 J8\text{ J}8 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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