Identify two wheel and axle machines. Classify simple machines as a lever, pulley, wheel or axle. A force is being used to change the state from rest to motion. Motion is controlled or changed by means of force. It is therefore motion at a constant velocity.
Motion generally involves a change of position of the object being moved.
A change of position is called a displacement. To state exactly how the position of the body changed, we must also state in what direction it was moved. Quantities such as displacement are called Vectors. A vector is characterized by the fact that it has both a magnitude or size and a direction. Quantities having only magnitude, such as the mass or length of an object are called Scalars.