PCH: ARM the RADIUS is the non-weight baring bone of the human arm of the animals front limbs
determined by the length of the lever arm and the weight of the load. The longer the lever arm, the less force is needed to lift the load. The force needed is inversely proportional to the length of the lever arm.
the one with the fulcrum closer to the weight you needed to lift
Depends on how young the child is.
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the bone at the top of arm is humerus
Leverage and momentum operate similarly in the weight room. When you lift a weight, for instance, your arm is the lever and the direction in which the weight swings carries the forward momentum.
A major application of the robotic arm in heavy industry is the ability to lift a significant amount of weight that is far greater than the human capacity.
It would require (3 X 10)/15 = 2 lb to lift the 3 lb weight. Actually, something a little greater than that. 2 lb is the force to balance it. (Obviously, the lever "has" no force. It requires the force to lift the weight.)
You will experience discomfort in your shoulder and neck area. You will be unable to lift your arm. And also your shoulder line will be quite deformed.
The humerus is informally referred to as the upper-arm bone.