| Term | Definition |
|---|
| Linear motion | When a body moves in a straight or curved line, with all its parts moving the same distance, in the same direction and at the same speed. |
| Angular motion | When a body or part of a body moves in a circle or part of a circle about a particular point called the axis of rotation. |
| General motion | A combination of linear and angular motion. |
| Inertia | The reluctance of a body to change its state of motion. |
| Acceleration | The rate of change of velocity. |
| Stability | Relates to how difficult it is to disturb a body from a balanced position. |
| Line of gravity | A line extending from the centre of mass vertically down to the ground. |
| Direct force | A force whose line of application passes through the centre of mass of a body causing the resulting motion to be linear. |
| Eccentric force | A force whose line of application passes outside the centre of mass of a body causing the resulting motion to be angular. |
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