A person is doing leg lifts with 3.00 kg ankle weights. The lower leg itself has a mass of 5.00 kg. When the leg is held still at an angle of 30.0° with respect to the horizontal, the patellar tendon pulls on the tibia with a force of 337 N at an angle of 20.0° with respect to the lower leg. Find the magnitude and direction of the force exerted on the tibia by the femur, assuming it is the only other significant force acting on the lower leg.

Transcribed Image Text:

Quadriceps muscle Patellar tendon 20.0° Patella Femur 30.0 Tibia