noun
a force that is equal in magnitude and opposite in direction to a force acting on a body
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The reaction force exerted on an object is equal in magnitude but opposite in direction to the action force applied to it.
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When you push against a wall, the wall pushes back with a reaction force.
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Dude, did you feel that reaction force when you tried to lift that heavy box?
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Her harsh words created a strong reaction force, causing him to retreat emotionally.