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.
Subject Index for all interactive diagrams
interactagram.com - Physics - Dynamics - Action = Reaction (Newton's Laws of Motion)
Source Flash: NewtonsThirdLaw.zip
Visits since 3-5-11: 1909
Interactagram.com uses third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you would like more information about this practice and to know your choices about not having this information used by these companies, click here.