Biomechanics Flashcards
Definition of linear motion
Movement of a body in a straight or curved line, where all body parts move the same distance, in the same direction, over the same time
How is linear motion created
When a direct force is applied to it
What is angular motion
Movement of a body or part of a body in a circular path about an axis of rotation
What is the centre of mass
The point which a body is balanced in all directions
What are the 3 principle axis of rotation
Longitudinal, transverse, frontal
What are the 5 key linear motion descriptors
Distance, displacement, speed, velocity, acceleration/deceleration
What is angular motion measured in
Radians - 1 radian= 57.3
How is angular motion created
A eccentric force (torque) is applied to a body outside the centre of mass
Description of the axis
Longitudinal runs head to toe through centre of mass e.g an ice skating spin. Transverse runs left to right through centre of mass e.g somersault. Frontal runs front to back e.g cartwheel
Explain angular velocity
Rate of change in angular displacement or the rate of change in rotation, measured in radians per second (r/s). Angular displacement/time taken.
Explain moment of inertia
The resistance of a body to change its state of rotation, measured in kgm/s. Sum of (mass x distribution of mass from the axis of rotation).
