Assume that the lower leg and the foot together have a combined mass of 4.0 kg , and that their combined center of gravity is at the center of the lower leg. As you hold your leg in this position, the upper leg exerts a force on the lower leg at the knee joint. What is the direction of this force?

Downward

Explanation:

When the upper leg exerts a force on the lower leg and the combined center of gravity of both the legs lies at the center of the lower leg then the line of action of this force will be acting downwards.

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.

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