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8 votes
8 votes
3rd newton law You step off a curb

User CP Sean
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1 Answer

24 votes
24 votes

-- Your foot hits the street.

-- Your foot exerts a force down onto e pavement.

-- The pavement exerts an equal force up against your foot. This is the force that stops you from going any farther down.

User Will Holtz
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3.2k points