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1.7 Energy, work and power

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Question 171

A cyclist freewheels (coasts without pedaling) down a hill, starting from rest and traveling faster as they descend.

What best describes the change in energy stores?

A

gravitational potential energy→kinetic energy+internal energy\text{gravitational potential energy} \rightarrow \text{kinetic energy} + \text{internal energy}gravitational potential energy→kinetic energy+internal energy

B

chemical energy→kinetic energy+internal energy\text{chemical energy} \rightarrow \text{kinetic energy} + \text{internal energy}chemical energy→kinetic energy+internal energy

C

gravitational potential energy+kinetic energy→internal energy\text{gravitational potential energy} + \text{kinetic energy} \rightarrow \text{internal energy}gravitational potential energy+kinetic energy→internal energy

D

kinetic energy→internal energy+gravitational potential energy\text{kinetic energy} \rightarrow \text{internal energy} + \text{gravitational potential energy}kinetic energy→internal energy+gravitational potential energy

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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