There are many action-reaction pairs all around you. Some examples that we have looked at in this lesson are support forces, catching balls, rockets and seat belts. Select one example of an action-reaction pair and explain how it works.
Question
There are many action-reaction pairs all around you. Some examples that we have looked at in this lesson are support forces, catching balls, rockets and seat belts. Select one example of an action-reaction pair and explain how it works.
Solution
Sure, let's take the example of a rocket launch to explain an action-reaction pair.
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The action in this scenario is the expulsion of high-speed gas from the rocket's engine. The rocket propels gas out of its engine at high speed.
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According to Newton's third law of motion, for every action, there is an equal and opposite reaction.
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The reaction in this scenario is the movement of the rocket in the opposite direction. When the gas is expelled downwards, the rocket moves in the opposite direction, i.e., upwards.
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The force exerted by the gas downwards (action) is equal to the force propelling the rocket upwards (reaction).
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This is how a rocket launch demonstrates an action-reaction pair. The rocket's upward movement (reaction) is a result of the force exerted by the expulsion of gas (action).
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