Types of Motion Flashcards
L11.3
What are the two types of Motion?
Linear (Translational) Motion
Angular (Rotational) Motion
What is Linear Motion?
It is commonly known as rectilinear or straight-line motion.
Force acts through the centre of the body.
Linear motion takes place when body moves same distance, same speed, same direction at the same time.
What is Angular Motion?
Refers to movement of body on an axis.
Force acts off-centre resulting in rotation.
Example of Linear Motion?
If a hockey player hits a hockey puck with equal force, it will theoretically move in a straight line provided that it doesn’t encounter bumps or the whatnot.
Example of Angular Motion?
When a basketball player decided to pass or shoot the ball. They often pivot on one foot in order to complete this.
Pivoting is an example of Angular Motion.
What are the three ways human physical activities can involve rotational/angular motion.
Rotations of projectiles or other objects (swinging a hockey stick)
Rotations of the entire human body about 1-3 axis’ (tumble of a gymnast).
Rotations of individual body segments (throwing of a softball pitcher’s arm).
What determines which type of motion occurs?
A centric force (force applied directly through the centre of an object or body) results in linear motion.
An Eccentric (off-centre) force, A force applied at a point other than the centre always results in Angular Motion (and sometimes linear).
Example of the two types of Motions combined?
A sprinter dashing down the track is an example of linear motion, but a great deal of the linear motions results from the forces produced by the rotational movement of the legs and arms.
