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Exercise Science Portfolio
Types of Motion


Newton's Laws
Types of Motion
The Seven Biomechanical Principles
Human Growth and Development
Stages of Human Development
Motor Development
Skill Acquisition
Motor Learning Concepts
Skill Acquisition Process

Linear and Rotational

It is important to understand the two types of motion involved in biomechanics which are: Rotational motion and Linear motion.


Linear Motion (Translational Motion)
Can be described as movement in a particular direction.  An example of this type of motion is a sprinter running down the track towards the finish line.  In this case the sprinter is using force generated by his or her muscles which results in motion in a straight line.
Rotational Motion
This type of motion refers to movement around an axis.  In rotational motion the force does not act upon the centre of mass.  It is rather off centred which results in the rotation of an object.  If a soccer ball is kicked through the centre of mass it will go in a straight line.  If it is kicked more to the side of the ball it will rotate and spin.
Linear Motion                                                 Rotational Motion
Displacement                                                  Angular Displacement
Velocity                                                          Angular Velocity
Accelearation of a Mass                                 Angular Acceleration
Force                                                             Moment of Force
Mass                                                              Moment of Inertia