A pair is formed by two equal and opposite parallel pressures that are not acting along the same line. The rotation must always be produced by a couple. Rotating a key in a lock and turning the steering wheel of a car are two examples.
A pair is formed by two equal and opposite parallel pressures that are not acting along the same line. The rotation must always be produced by a couple. Rotating a key in a lock and turning the steering wheel of a car are two examples.