We know that forearms typically weigh only a few pounds, but the ball weight is 50 lbs, so the forearm weight is about an order of magnitude (10x) smaller than the ball weight [2] . Therefore, let’s a...We know that forearms typically weigh only a few pounds, but the ball weight is 50 lbs, so the forearm weight is about an order of magnitude (10x) smaller than the ball weight [2] . Therefore, let’s assume the forearm weight doesn’t matter much and continue solving our biceps force problem only including the weight of the ball, which acts at the center of gravity of the ball.
