Biomechanical Principles :) Flashcards
linear motion
motion in a straight or curved line with all body parts moving the same distance, same speed and same direction
newtons first law (inertia)
every body continues in its state of rest or motion unless acted upon by an external force
newtons second law (acceleration)
the magnitude (size) and direction of the force determines the magnitude and direction of the acceleration
force = mass x acceleration
newtons third law (action/reaction)
for every action there is an equal and opposite reaction
speed
-rate of change of position
speed = distance ÷ time
distance
- length of the path a body follows when moving from a to b
- scalar quantity
distance = speed x time
centre of mass
the point of balance of a body
changes as the body moves
factors affecting stability
- height of centre of mass - lowering the com increases stability
- position of the line of gravity - should be central over com to increase stability
- area of base of support - more contact points = increased are of base leading to increased stability
- mass of the performer - the greater the mass, the more stable you are
first class lever
second class lever
third class lever
mechanical advantage
where the effort arm is longer than the resistance arm
- move large load over a short distance
- short range of movement
- difficult to generate speed and distance
mechanical disadvantage
where the resistance arm is longer than the effort arm
- cant move as heavy a load
- can do it faster
- large range of movement
1st mechanical advatage
large range of movement and resistance can be moved quickly
1st mechanical disadvantage
cant apply much force to move an object
