A bodybuilder configures a leg-press apparatus to a resistanceof 230 lb (about 1

Question

A bodybuilder configures a leg-press apparatus to a resistanceof 230 lb (about 1000N). She pushes the weight to her fullextension and comes to reset. What is the normal force on each ofher feet? Assume she is able to move the push-plate of theleg-press machine at an acceleration of .50 m/s2 for thefirst half of the displacement. What is the normal force on eachfoot during this period of acceleration? Assume the resistive forceis due to a weight of 230 lb hanging from the end of thecable. The answers are 500 N for the first question and 530 N for thesecond. Just need to know how to get them. Thanks. A bodybuilder configures a leg-press apparatus to a resistanceof 230 lb (about 1000N). She pushes the weight to her fullextension and comes to reset. What is the normal force on each ofher feet? Assume she is able to move the push-plate of theleg-press machine at an acceleration of .50 m/s2 for thefirst half of the displacement. What is the normal force on eachfoot during this period of acceleration? Assume the resistive forceis due to a weight of 230 lb hanging from the end of thecable. The answers are 500 N for the first question and 530 N for thesecond. Just need to know how to get them. Thanks.

Explanation / Answer

Draw a diagram on your own. Question 1: Comes to rest, so a=0. This means that bothfeet are holding 1000N together. Divide 1000N/2feet will give you500N for each foot. Question 2: F=ma=2P-1000, where P is the normalforce due to one foot.

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