3.1Biomechanics- linear motion Flashcards
What is linear motion?
Movement of a body in a straight or curved line, where all parts move the same distance, in the same direction over the same time
Example of linear motion
A water skier on a flat lake being pulled at constant speed will travel in linear motion as all parts of body travel in same direction over the same distance
What is a direct force?
A force applied through the centre of mass resulting in linear motion
Why does linear motion occur?
From a direct force being applied to a body, where the force is applied directly to the centre of mass.
What is centre of mass?
The point at which a body is balanced in all directions.
What are the 5 important key terms to describe motion?
Distance
Displacement
Speed
Velocity
Acceleration/ deceleration
What is distance and what is it measured in?
The total length covered from start to finish positions (m)
What is displacement and what is it measured in?
The shortest strait line route from start to finish positions (m)
What is speed and how is it calculated?
The range of change in distance (m/s)
Distance / Time taken
What is acceleration and how is it calculated?
The rate of change in velocity (m/s/s)
(Final velocity - Initial velocity)
/ time taken
What is velocity and how is it calculated?
The rate of change in displacement (m/s)
Displacement / time taken
What is deceleration and how is it calculated?
The rate of change (decrease or negative) in velocity (m/s/s)
(Final velocity - Initial velocity)
/ Time taken
What are the 3 graphs of linear motion?
Distance/Time
Speed/time
Velocity/Time
What is a distance/ time graph
Shows the distance a body travels over a period of time
