tHomework & Problem 9.36 Problem 9.36 Part A The Achiles tendon is attached to t

Question

tHomework & Problem 9.36 Problem 9.36 Part A The Achiles tendon is attached to the rear of the foot as shown in Fque 1. A person elevates himsef jst barely off the floor on the ball of one foot Assurne the person has a mass of 67 kg and D s twice as long as d Find the tension Fr in the Achiles tendon (puling upward) Express your answer to two significant figures and inclade the appropriate units Fr1500 N Incorrect: Try Again; 5 attempts remaining Part B Find the (downward) force Fuh exerted by the lower leg bone on the foot Express your answer to two significant figures and include the appropriate units. Fr Achilles tendon Leg bone Ball of foot P 2300 N Submit My Answers Give Ue Incorrect; Try Again; 5 attempts remaining Type here to search

Explanation / Answer

9.36) the system is a class 2 lever (like a wheelbarrow)

the Achilles is lifting , the leg bone is supplying the load , and the ball of the foot is the fulcrum

the tension in the Achilles is transmitted to the skeletal system (leg bone)

Fb = m g + Ft

from the lever ___ 3 Ft = 2 Fb

substituting ___ 3 Ft = 2 (m g + Ft) = 2 m g + 2 Ft

subtracting 2 Ft ___ Ft = 2 m g = 2*67*9.8 = 1313.2 N

substituting back ___ Fb = m g + 2 m g = 3 m g = 3*67*9.8 = 1969.8 N

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