Equilibrium is balance.For an object to be in equilibrium:
1. Equilibrium: the sum of the linear forces acting on the object in any direction must = 0 |
The forces acting toward the left cancel out the forces action to the right so the vehicle is in equilibrium. 2. Equilibrium: the sum of the moments at any point must = 0 An object is in equilibrium, i.e. it is balanced and not turning or moving when the sum of the clockwise moments about a point is equal to the sum of the anticlockwise moments about the point. |
The see-saw is balanced because the clockwise moment is equal to the sum of the anticlockwise moments, i.e. Moment = Force x Distance Moment at A = 50N x 2m = 100Nm anticlockwise moment Moment at B = 50N x 1m = 50Nm anticlockwise moment Anticlockwise moment at A + B = 150Nm Moment at C = 150N x 1m = 150Nm clockwise moment The see-saw is balanced because the clockwise moment is equal to the sum of the anticlockwise moments. |