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| Action Force |
One of the pair of forces described in Newton's Third Law. |
| Reaction Force |
The force that is equal in strength and opposite in direction to the action force, which acts simultaneously on whatever is exerting the action force. |
| Newton's Third Law |
Whenever one body exerts a force on a second body, the second body exerts an equal but opposite force on the first. |
| Force |
Any influence that tends to acceleratean object; a push or pull; measured in newtons |
| Acceleration |
The rate at which velocity changes |
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