The right-hand rule is a simple mnemonic for determining the direction of an angular displacement. It is based on the following principle:

* If you point your right thumb in the direction of the rotation, your fingers will curl in the direction of the angular displacement.

To use the right-hand rule, simply place your right thumb in the direction of the rotation, and then curl your fingers. The direction that your fingers are pointing is the direction of the angular displacement.

For example, if you are rotating a wheel clockwise, your right thumb would be pointing in the clockwise direction. Your fingers would then be curled in the counterclockwise direction, indicating that the angular displacement is in the counterclockwise direction.

The right-hand rule can also be used to determine the direction of the net angular velocity of a rotating object. To do this, simply point your right thumb in the direction of the object's angular velocity vector. Your fingers will then curl in the direction of the net angular velocity.

For example, if a wheel is rotating clockwise at twice the speed of another wheel that is rotating counterclockwise, the net angular velocity vector would be in the clockwise direction. Your right thumb would be pointing in the clockwise direction, and your fingers would be curled in the counterclockwise direction.