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Explain how a thumbtack is designed so that you do not have to use a lot of force to push it through paper or the surface of a bulletin board?

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buzzybee
a thumbtack is designed so that you do not have to use a lot of force to push it through the surface by having a wide top for your thumb to push into, transferring the energy to the tack, and eventually the substance, once the tack is in.

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