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Give a reason : We can easily move our ...

Give a reason : We can easily move our hand in air but to do the same in solid block of wood we need a Karate expert.

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We can easily move our hand in air because air molecules are far apart and there is no force of attraction between them. On the other hand the wooden particles are very close to each other and are strongly bound. Therefore, a very large force is needed to move them apart.
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