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6. The centre of mass of a body is the point through which a single force on the body (usually weight) has a turning effect.
7. The "moment of a couple" or a "torque" is defined as:
- The link between two train carriages.
- A pair of unequal and opposite forces acting on a body, but along the same line.
- A pair of unequal forces acting on a body in opposite directions along the same line.
- A pair of equal and opposite forces acting on a body, but not along the same line.
- A pair of equal and opposite forces acting on a body along the same line.
8. An object of unstable equilibrium will return to it's original position if displaced.
9. A relatively stable object (e.g. a filing cabinet) will topple over if it's centre of mass passes over the pivot point around which it is moving.
10. If an object is acted upon by three forces which are not in equilibrium, a triangle will be formed by a scale free body force diagram.
