Newton's third of three laws concerning motion states that whenever a body exerts a force on another body, there is an equal and opposite force exerted on the first body.
You can see this law in action above by varying the force exerted by the sled on the right on the sled on the left, and noting how the force is actually exerted on both sleds equally, but in opposite directions.
You can also see that the proportional relationship discussed in Newton's Second Law, A ∝ F/M (∝ is the symbol for "directly proportional to") still holds true for each sled, with the same F being used for both acceleratons, only differing in sign.
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interactagram.com - Physics - Dynamics - Action = Reaction (Newton's Laws of Motion)
Source Flash: NewtonsThirdLaw.zip
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