4.10

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From: Lydia Anna Foley
Sent: Wednesday, September 07, 2011 2:10 PM
To: lydiafoley@posterous.com
Subject: 4.10 ((nogallery))

· 4.10 understand that work done is equal to energy transferred

PFY p.112

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a) the work done (measured in joules) is equal to the force (in newtons) multipulied 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). work dorn + energy transferred.

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word done = 5 x 2 = 10 J

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work done =

500 N x 40m = 20,000 J
Collins p. 91
W = m x g W = 400 x 10
W = 4000n

Wd = F x d 50000J = 4000 x d d = 12.5 m

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