Biomechanical Principles And Levers Keywords Flashcards
Linear motion
Motion in a straight or curved line, with all body parts moving the same distance at the same speed in the same direction
Inertia
The resistance an object has to a change in its state of motion
Newton’s first law of inertia
A force is required to change the state of motion
Newton’s second law of acceleration
The magnitude (size) and direction of the force determines the magnitude and direction of the acceleration
Newton’s third law of motion
For every action (force) there is an equal and opposite reaction (force)
Ground reaction force
The equal and opposite force exerted on a performer who applies a muscular force on the ground
Scalar quantity
When measurements are described in terms of just their size or magnitude
Centre of mass
The point of balance
Line of gravity
The line extending vertically downwards from the centre of mass
Area of support base
The larger the area, the greater the stability
Fulcrum
The 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
First class lever
The fulcrum lies between the effort and resistance
Second class lever
The resistance is between the fulcrum and effort
