A claw hammer is used to pull a nail out of aboard (Fig. P 1.52). The nail is at

Question

A claw hammer is used to pull a nail out of aboard (Fig. P 1.52). The nail is at an angle of 60 degree to the board, and a force 1 of magnitude 400 N applied to the nail is required to pull it from the board. The hammer head contacts the board at point A, which is 0.080 m from where the nail enters the board. A horizontal force 2 is applied to the hammer handle at a distance of 0.300 m above the board. What magnitude of force 2 is required to apply the required 400-N force (F1) to the nail? (You can ignore the weight of the hammer.)

Explanation / Answer

to pull the nail torque about the point A shouyld be balanced ,

= r X F

0.3 X F2 + 0.080 X F1sin60 = 0

F2 = - 0.080 X 400 X sin60 / 0.300 = - 92.38 N

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