Types of Motion
Linear motion: All parts of the body move the same distance in the
same direction and at the same time. Also called translation.
Examples:
Rectilinear motion:
movement follows a strait line.
Examples:
Curvilinear motion: path of movement is curved.
Examples:
Angular motion: Occurs when a body moves along a circular path,
through the same angle, in the same direction, at the same time
Examples:
The axis of rotation: the point about which movement occurs

General motion: A combination of linear and angular motion

Causes of Motion

Force: Any action, a push or pull, which tends to cause an object to
change its state of motion by experiencing acceleration.
Constant Velocity: Occurs when an object is not accelerating
Linear Motion: Caused by forces which act through a body’s centre of mass
Examples:
Angular motion: Caused by forces that do not go through the centre
of mass. Force causes object to rotate about an axis.
Examples:
Moment of Force:
The effect of a force causing angular motion.
Also called torque.
Examples:
 Two factors affect moment of force
1. moment arm: distance from axis of rotation to point of force
generation
2. magnitude of force
Moment of Force = Moment Arm + Force