by Anonymous on October 7th, 2008

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How many pounds of force must a man exert on one end of an 8 foot lever to lift a 300 lb rock on the other end if the fulcrum is 1.5 feet from the rock?

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by Drublic on October 7th, 2008
You need to calculate the moment, which is force times distance. In this case, the moment required to lift the rock and the moment required by the man must be equal. If the distance from the rock to fulcrum is 1.5 feet, then the distance from the fulcrum to the man's force is 6.5

X equals the force required by the man, so

1.5*300=6.5*X
X = 69 lbs
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How many pounds of force must a man exert on one end of an 8 foot lever to lift a 300 lb rock on the other end if the fulcrum is 1.5 feet from the rock?

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How many pounds of force must a man exert on one end of an 8 foot lever to lift a 300 lb rock on the other end if the fulcrum is 1.5 feet from the rock?

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