why can you stick different parts of your body(head, hand, finger) in small gaps really easily but you can’t take them back out?
In: Physics
My guess is it relates to the skin. When the skin is pulled back and taut, it makes the area less wide, or smaller in a sense.
If you hold your hand out with the palm side down, and push the skin on the back of your hand towards you/back, it smooths down closer to your bones.
If you then push the skin up towards your knuckles/away from you, it bunches up and wrinkles, thus making the area wider and expand in a way.
Your skin is made taut and is pulled back when you first enter a niche or small gap, making it very easy to slide in to as it’s less resistance. The skin is then wrinkled and bunched when you try to pull back out, which makes that portion of your body wider than when it first entered, thus making it very difficult if not impossible to get back out.
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