For each problem state all unknowns and FBD. When using a FBD clearly identify a
ID: 1848768 • Letter: F
Question
For each problem state all unknowns and FBD. When using a FBD clearly identify all given parameters in the problem. Show your work; use a step by step approach. Figure 1 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 with the horizontal. Point O represents the knee joint, point 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 points O and A, and b is the distance between point 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 W and F. If a = 20 cm, b = 40 cm, = 30degree, W = 60 N, and F = 200 N, calculate the net moment about O. Figure 1.Explanation / Answer
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