Describe how a wheel and axle machine makes works easier. Explain that force is gained when effort is applied to the wheel of a wheel and axle machine. 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.