4.10

· 4.10 understand that work done is equal to energy transferred

PFY p.112

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1. a) The work done (measured in Joules) is equal to the force (in Newtons) mutiplied by the distance moved (in metres).
b) 1 Joule is the work done when a force of one newton moves through a distance of one metre in the direction of the force.
c) Work done = energy transferred

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2. Wd = F x d
= 5N x 2 metres
= 10 Joules

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Wd = F x d
= 500 N x 40 m
= 20000 Joules = 20kJ

Collins p. 91

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Wd = F x d
50000J = F x 400kg
F = 125N