Chapter 4 : Turning effects of forces

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5 Terms

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moment

the turning effect of a force about a pivot

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moment formula

moment = force × perpendicular distance from the pivot

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conditions for equlibrium

net force = 0
net moment = 0

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center of gravity

the point where the whole of the weight of the object appears to act

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experiment to investigate the center of gravity of an irregular lamina

make three holes along the edge of the lamina

fix a pin horizontally in the clamp, then hang the lamina from the pin making sure it can swing freely

suspend a string from the same pin an mark the positions of the string on the lamina using a pencil

repeat the experiment with the lamina suspended from the other holes

draw lines to connect each pair of points. where the lines cross is the center of gravity