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20 June, 11:05

A 20 kg crate of books is at rest on a table. what is the normal force on the books?

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  1. 20 June, 13:04
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    The weight of 20 kg is

    (mass) x (gravity) =

    (20 x 9.8) = 196 newtons, downward.

    There must be a force of 196 newtons upward on the mass.

    Otherwise the mass is accelerating either up or down.
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