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Biomechanical Principles Relating to Motion

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Stephen Crookes

on 1 August 2016

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Transcript of Biomechanical Principles Relating to Motion

Biomechanical Principles Relating to Motion
2. Angular Motion
Angular motion, also referred to as rotation (circular motion), takes place when a body moves around an axis of rotation.
All parts of the body travels through the same angle, in the same direction, in the same time.
In other words, the whole body, a body segment or a piece of sporting equipment moves in a full or part circle.
1. Linear Motion
Linear motion takes place when a body moves, so that all the parts of the body travel exactly the same distance, in the same direction, in the same time.
This motion can be either in a straight or a curved line.
An example of linear motion of the whole body is sprinting - all parts of the body move in the same direction at the same time, and travel the same distance.
2. Angular Motion
Axis of Rotation
The Axis of Rotation can be along one of the following:
3. General Motion
The most common form of motion in sporting activities, is a combination of both linear and angular motion.
For example, a cyclist's body undergoes linear motion, as the result of the angular motion of their legs.
Another example is swimming freestyle. The angular motion of the arms turns into linear motion of the body.
Motion is used to describe the path of the body.
The word "body" can refer to an inanimate object (non-living) object, as when we talk about
the flight of a ball or javelin.
Or, the human body as a whole.
Or, to a part of the human body, as in the movement of the lower leg when kicking a football.
In general, all motion can be described as either LINEAR or ANGULAR or as a combination of these 2, which is referred to as GENERAL motion.
How it is classified depends on the path followed by the moving body.
An effective means of deciding whether the whole body is undergoing linear motion, is to draw a line between two parts of the body.
If the line remains in the same position as the body moves from one point to another, then the motion is linear.
The AXIS OF ROTATION is an imaginary line around which a body, or part thereof, rotates.
External or Internal: The axis of rotation may not pass through the body itself. For example, a gymnast completing a giant swing on the high bar (axis of rotation is outside "external" to the body, around the bar). While someone doing sit ups, the axis of rotation is at the hips (internal).
Vertical or Longitudinal Axis:
head to toe vertically - rotation is in the transverse plane.
Horizontal or Transverse Axis:
hip to hip horizontally - rotation in the sagittal plane.
Medial Axis:
navel to the small of back horizontally
Almost all sporting activities involve some form of angular motion, where one part of the body is moving relative to the other parts.
Task 1: Analysing Basic Movement Patterns.

Choose a partner.
Identify the key features (crucial to the effective performance) for the preparation, release and follow-through phase of a Volleyball Overhead serve (use template provided).
Film/record your partner performing the Overhead Volleyball Serve.
On your key features check list, highlight the features that are demonstrated by the performer.

Task 2: Types of Motion.

Observe your performance, in slow motion, or frame by frame, if possible.
Break the skills down into instances of linear motion and angular motion.
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