The most commen example given is stepping out of a row boat. You go forward, the boat goes backward.
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Equal in magnitude and opposite in direction.
for every action,there is an equal and opposite reaction
Because every action has an equal and opposite reaction. The action is you running into a wall, and the opposite reaction is you falling down.
The statement by Newton that for every action there is an opposite by equal reaction is regarded as the third of Newton's laws of motion. This means that in every interaction there is actually a pair of forces acting on the two objects that are equal but work in opposite directions.
The answer is in the categories Isaac Newton