Figure 3.31 illustrates a simplified version of a hamstring strength training sy

Question

Figure 3.31 illustrates a simplified version of a hamstring strength training system for rehabilitation and athlete training protocols. From a seated position, a patient or athlete flexes the lower leg against a set resistance provided through a cylindrical pad that is attached to a load. For the position illustrated, the lower leg makes an angle theta with the horizontal. Point O represents the knee joint A is the center of gravity of the lower leg, W is the total weight of the lower leg, F is the magnitude of the force applied by the pad on the lower leg in a direction perpendicular to the long axis of the lower leg, a is the distance between O and A, and b is the distance between O and the line of action of F. measured along the long axis of the lower leg. Determine an expression for the net moment about O due to Wand F. If a =20cm, b = 40cm, theta = 30degree, W = 60N,and F =200 N, calculate the net moment about O.

Explanation / Answer

a) we will use that Moment = F * r perp
so
net moment = Fb - Wa cos

b) netmoment = 200*40E-2 - 60*20E-2*cos(30)=69.6

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