Unit 7 · Force and Motion

Newton's Third Law of Motion Presentation

ScienceSubject
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Science and Technology, Class 9

Newton's Third Law of Motion

Action and reaction · Forces in pairs

Today's objectives

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State Newton's third law

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Pick out the action and the reaction in an event

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Explain why these forces never cancel each other

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Presenter notes: Today we study a striking habit of forces: a force never acts alone. Start by asking a student to stand and take a couple of steps, then ask the class what the foot is doing to the ground.