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A muscle operates by getting shorter. It's tied to a bone, and can only pull the bone,

not push it. In order for the muscle to return to its original length, a different muscle,

on the other side, has to pull the bone in the opposite direction. So, inside the 'machinery',

muscles can only pull, not push. Outside the machine, of course, the hand or the leg

moves, and those can be rigged to objects in the outside world in ways that permit

pulling or pushing.

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12y ago
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Q: Is muscular force a pull or a push force or both?
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