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| Newton's third law |
When one body exerts a force on a second, the second body exerts and equal and opposite force on the first. |
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| Force |
A push or pull of any object, that tends to accelerate. |
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| 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. |
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| Action force |
one of the pair of forces described in Newton’s 3rd law. |
| Mass |
The amount of matter in an object: a measure of an object’s inertia. |
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| Weight |
Measure of gravitational force acting on an object |
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