A+P Chapter 2 Basic Concepts Of Biomechanics Flashcards
Define angular motion?
When a body or part of a body moves in a circle or part of a circle about a particular point called the axis of formation.
Define linear motion?
When a body moves in a straight or curved line, with all its parts moving the same distance, in the same direction and at the same speed.
Define general motion?
A combination of linear motion and general motion.
Give a sporting example of angular, linear and general notion?
Angular motion- a female gymnast on the uneven bars
Linear motion- skeleton bob event or shot put
General motion- wheelchair athlete or javelin
What’s Newton’s first law of motion?
The law of inertia. ‘A body continues in a state of rest or uniform velocity unless acted upon by an external force.’
What’s Newton’s second law of motion?
The law of acceleration. ‘When a force acts on an object, the rate of change of momentum experienced by the object is proportional to the size of the force and takes place in the direction in which the force acts.
What is Newton’s third law of motion?
For every action there is an equal and opposite reaction.
Define inertia?
The reluctance of a body to change its state of motion.
Define centre of mass?
The point at which the body is balanced in all directions.
How is the stability of an athlete determined?
Position of athletes centre of mass.
Position of athletes line of gravity.
Size of the athletes base of support.
Define stability?
Relates to how difficult it is to disturb a body from a balanced position.
Define line of gravity?
A line extending from the centre of mass vertically down to the ground.
Define direct force?
A force whose line of application passes through the centre of mass of a body causing the resulting motion to be linear.
Define eccentric force?
A force whose line of application passes outside the centre of mass of a body causing the resulting motion to be angular.
