Homework Help: Physics

Posted by Kayla on Monday, June 23, 2008 at 9:38am.

A man pulled a nail our of a board with a crowbar. The nail was 2 in. from the fulcrum of the crowbar, and the effort applied was 36 in. from the fulcrum. If the theoretical effort applied was 10 lb., what was the force of friction between the board and the nail? How far did the hand have to move in order to move the nail one inch?

I do not know where to start.

Physics - bobpursley, Monday, June 23, 2008 at 11:07am
IT is a lever.

Mechanical ADvantage= 36/2

ForceonNail= MA*10lb

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