The physics of stubbing your toe
Walking into a wall or a doorway and hitting your toe can be very painful. Their is a logical explanation for this pain. Walking requires a lot of energy because to walk you must produce friction with the ground with your legs. People swing their legs forward to take another step. When you swing your leg out into a wall and hit your toe, all of the force from the swing goes directly into your toe. It isn't the force that you supply that hurts your toe but the force the wall exerts back on you when you hit it. All of the force that you provide comes back into your toe and tests the strength of the bones in your toe. If enough force is put into the swing, the same amount of force will be exerted into your toe when you hit the wall and break your toe. After hitting my toes many times I've learned to slow down in my house.
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