5.1 Biomechincal Principles And Levers Flashcards
Linear motion
Motion in a straight or curved line , with all body parts moving same distance at same speed
In same direction
Inertia
Resistance an object has to change in its change of motion
Newtons 1st law of inertia
Force is required to change the state of motion
Newtons 2nd law of acceleration
The size and direction of the force determines the size and direction of the acceleration
Newton’s third law of motion
For every action there is a an equal and opposite reaction
Ground reaction force
Equal and opposite force exerted on a performer
who applies a muscular force on ground
Scalar quantity
When measurements are described in terms of just their size or magnitude
Centre of mass
This is the point of balance
Line of gravity
Line extending down from the centre of mass
Area of support base
Larger the area = greater the stability
Fulcrum
Point about which the lever rotates
Resistance
The weight to be moved by the lever system
Effort
The force applied by the user (muscle) of the lever system
1st class lever
The fulcrum lies between the effort and resistance
2nd class lever
Resistance is between the fulcrum and effort
