3. The ability of a muscle to cause joint rotation is affected by the amount of force the muscle can produce and the angle of the line of action with respect to the bones to which it attaches. A muscle's angle of action changes as the joint rotates. Assume the forearm is at a 90 degree angle relative to the upper arm. If the biceps muscle exerts a 210 N force pulling at 80 degrees (see diagram above), and the triceps muscle exerts a 290 N force at an angle of 85 degrees, in which direction will the forearm move? Assume the forearm has no mass