Question

The upper leg muscle (quadriceps) exerts a force of 1200 N, which is carried by a tendon over the kneecap (the patella) at the angles shown in (See attached image). Find the magnitude and direction of the force exerted by the kneecap on the upper leg bone (the femur).

 ..........................N
 ..........................° (counter-clockwise from an axis directed to the left)

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Newtons Laws of Motion

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