Biomechanices Flashcards
What is angular motion
Rotary or circular motion
The movement if body segments or implements that are swung in a full or half circle during a sporting action
Measurable in vary units, most commonly degrees
What is linear motion
Describes motion along a line that is either:
- Rectilinear (straight line)
- curvilinear ( curved trajectory)
Represented through movement of the body as a whole
Measured in length such as cm or m
Curvilinear motion used in a 400m sprint when turning
Rectilinear motion used in a netball pass
What is general motion
This is where angular motion of a number of body segments produces linear motion of the body. This is collectively referred to as general motion.
Generation of force
Muscles enable force to be applied to the attached bone- they pull on a bone (for example the bicep muscle pulls on the radius), which then causes the forearm to flex at the elbow joint.
Athletes undertake a weight training program to increase the cross sectional area of a muscle allowing more force to be produced, which in turn permitting the forearm either to rotate more quickly or to rotate against a greater load
What is newtons first law
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force
What is Newtons second law
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Force production formula (newtons 2nd law)
F = m x a
Where
F: force applied
M: mass of object to which force is applied
A: acceleration of the object
Newtons third law
For every action there is an equal and opposite re-action.
Force absorption formula
F = (V2 - V1) / t
Where
V2: velocity at end of movement
V1: velocity at start of movement
T: time from V1 to V2
COG
Centre of gravity
