| A | B |
|---|
| balanced | a stable condition in which forces cancel one another |
| balanced moments | moments are balanced when the resultant turning effect created by applied forces is zero |
| center of gravity / centre of gravity | the point at which all the weight of an object is imagined to be concentrated |
| unstable | not firmly fixed and likely to wobble or fall |
| stable | resistant to change of position |
| counterweight | a weight that exactly balances another weight |
