He moved his finger on the wedge and the direction of motion changed.

The direction of motion depends on the connection between the objects.

It can change the direction of motion but never change the speed.

The direction of motion through the night now changed.

It wasn't hard to tell his direction of motion, once he got the setting sun placed in the west.

The direction of motion was rather steady, varying between 285 and 300 degrees heading.

Boundary movement is discontinuous and the direction of motion may change suddenly.

The planet's surface began to turn under us as I changed our direction of motion.

The component parallel to the direction of motion is called drag.

That was pointed over the left side, at ninety degrees to the combat car's direction of motion.