###### Question:

I thought the normal force would be in the opposite direction ofthe downward force but I was told The normal force vector you havedrawn does not balance. The femur would move in theverticaldirection
To measure the effective coefficient offriction in a bone joint, a healthy joint (and its immediatesurroundings) can be removed from a fresh cadaver. The jointisinverted, and a weight is used to apply a downward force on the head of the femur into the hip socket. Then, ahorizontal force is applied and increased in magnitude until the femurhead rotates clockwise in thesocket. The joint is mounted in sucha way that will cause clockwise rotation, not straight-line motionto the right. The friction force will point in a direction tooppose this rotation.Draw vectors indicating the normal force (magnitude anddirection) and the frictional force (direction only) acting on the femur head at pointA.

Assume that the weight of the femur isnegligible compared to the applied downward force.

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