Which ones are used?

ok so we all know that we are constantly being acted appon by forses… well if you just walk into a room to pic up a book or something, what kind of forses are used?

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Answer #1

Gravity is acting against you for picking up the book. You’re using kinetic force to pick it up…your muscles use chemical energy to generate the force needed.

Answer #2

Gravity and friction would be two.

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Which ones are used?

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