Physics

A man doing push-ups pauses in the position shown in the figure . His mass = 68 kg.
Image: img145.imageshack.us/img145/7130/picture1n.png

a= 40 cm
b= 95 cm
c= 30 cm

Determine the normal force exerted by the floor on each hand.

Determine the normal force exerted by the floor on each foot.

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  1. Let Fl be the force upward on the hands, Fr be the force on his toes.

    Fr+Fl=weight
    Now sum moments about any point, I will sum them about the feet. Clockwise moments are postive. -weight*b+Fl*(a+b)=0

    you have two equations, two unknowns (Fl,Fr). solve. Now for each hand,divide Fl by 2, and for each foot, divide Fr by 2.

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    bobpursley

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