When you bend your knee, the quadriceps muscle is stretched. This increases the

Question

When you bend your knee, the quadriceps muscle is stretched. This increases the tension in the quadriceps tendon attached to your kneecap (patella), which, in turn, increases the tension in the patella tendon that attaches your kneecap to your lower leg bone (tibia). Simultaneously, the end of your upper leg bone (femur) pushes outward on the patella. The figure shows how these parts of a knee joint are arranged. What is the direction of the force exerted by the femur on the kneecap?

Explanation / Answer

From the diagram, and the data given
the direction of the force on the kneecap by the Femur must be such that the system is in equilibrium
also, the kneecap will observe force perpendicular to the surface joining the femour and the kneecap
and from force balance
Femur will apply force that is antiparallel to the resultant of the force Due to Quadricep tendons and Patella tendon onto the knee cap

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