A bodybuilder configures a leg-press apparatus (see figure) to a resistance of 1

Question

A bodybuilder configures a leg-press apparatus (see figure) to a resistance of 1100 N (about 248 lb). She pushes the weight to her full extension and comes to rest.

(a) What is the normal force on each of her feet?

N

(b) Assume she is able to move the push-plate of the leg-press machine at an acceleration of

0.50 m/s2

for the first half of the displacement. What is the normal force on each foot during this period of acceleration? Assume the resistive force is due to a mass with weight of 1100 N hanging on the cable of the leg-press apparatus.

N

Explanation / Answer

a) 1100/2 = 550N

b) [1100 + (112*0.5) ] /2 = 578N

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