why we can easily move our hand in air but felt difficulty in fuction of each
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Particles of air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hand in air but to do the same through plank of wood, we need a karate expert.
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Answer:
we use muscular force
Explanation:
air is rarer than our hand
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