pe definitions

Created by

safie matthews

Cards (58)

performance routines
A ritual a performer follows in the preparation for / during the execution of a task / skill
Force length
relationship between the muscle length is determined by the force a muscle can produce.
all or nothing
once a motor unit receives an impulse that reaches the required threshold, all of the muscle fibers associated with that motor unit will contract at the same time with maximum force.
segmental interaction
is the transfer of momentum across joints of the body
form drag
is the pressure differential between the front and the back of an object moving through a fluid creating a suction effect.
surface drag
Resistance on a moving object caused by a fluid moving over the surface of the object.
wave drag
wave drag is the resistance formed by the creation of waves by the body at the point where water and air interact.
Task cohesion
the degree to which members of a group are committed to achieving their predetermined goal
Moment of inertia  
The resistance of an object to rotate
Law of inertia
a body will continue in its state of motion or state of rest unless acted upon by an eternal unbalanced force
Law of acceleration
The acceleration of an object is directly proportional to the size of the applied force and the inversely proportional to the mass.
Law of action and reaction  
for every action there is an equal and opposite reaction
Angular momentum
refers to the amount of motion an object has when rotating
angular velocity  
rate or change of angular displacement
summation of forces
the amount of force that a body creates for a desired movement
Coefficient of restitution
a measure of the amount of energy remaining in collision between 2 objects measured on a scale of 0 -1, 0 perfectly inelastic and 1 perfectly elastic.
Balance
The ability to neutralise force that disturb equilibrium
stability
an objects resistance to movements, from a balanced position
levers
a ridged bar like object that turns around a fixed point and forces are applied at 2 other points
momentum
the amount of motion an object has
Impulse
impulse is the application of force over time to change momentum force X time
Bernoulli's principle
the velocity of a fluid traveling over a moving object is proportional to the surrounding pressure
Magnus
the effect of rotating on an objects path as it moves through a fluid
friction
a force that opposes motion caused by the interaction of 2 surfaces against each other.
Drag
a backwards force produced by the motion of a body in a fluid.
projectile
is an object that only being subjected to the force of gravity
trajectory
the path a projectile follows through the air. it is a combination of vertical and horizonal motion.
Wave drag
the resistance caused by the creation of waves at the point that water and air interact.
form drag
resistance on a moving object caused by the pressure differential between the front and the back of the object
surface drag
resistance of a moving object caused by a fluid moving over the surface of the object
laminar flow
fluid flows in parallels lines with no disruption
turbulent flow
fluid undergoes irregular fluctuations or mixing
motor neuron
a nerve cell that stimulates muscle fibres
motor unit
a motor neuron and the muscle fibres that innervates.
sensory neuron
a nerve cell connected to sensory organs ( such as ears and eyes)
concentric contraction
muscle contraction where the muscle length shortens
isometric contraction
contraction where muscle tension increases but the length of the muscle stays the same
force velocity relationship
the relationship states that the speed of the muscular contraction determines the amount of force that a muscle can produce
stages of S.F.T
motor neurons stimulates the muscle fibre with a neural impulse form the brain, calcium ions are then released into the sarcomere raveling binding sites on actin
neuromuscular system order
sensory neurons
brain
spinal cord
motor neuron
motor unit