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1.7 Energy, work and power

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Question 32

A constant resultant force F F\,F accelerates a block of mass m m\,m from rest along a frictionless horizontal floor to a speed v v\,v over a distance sss, giving it kinetic energy EkE_kEk​. Which pair of relationships for this situation is correct?

A

Ek=12mv2E_k = \frac{1}{2}mv^2Ek​=21​mv2 and Fs=EkFs = E_kFs=Ek​

B

Ek=mv2E_k = mv^2Ek​=mv2 and Fs=EkFs = E_kFs=Ek​

C

Ek=12mv2E_k = \frac{1}{2}mv^2Ek​=21​mv2 and F=EksF = E_k sF=Ek​s

D

Ek=mv2E_k = mv^2Ek​=mv2 and F=EksF = E_k sF=Ek​s

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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