define equilibrium
refers to the state in which there is a balance of forces or influences in opposition to each other
define static equilibrium
state in which a body has zero velocity & zero acceleration.
eg. ball stationary or gymnast balanced on a beam
define dynamic equilibrium
state in which a body is in motion with a constant velocity created by balanced forces
eg. running at a steady pace
define stability
the degree to which a body resists changing its equilibrium
higher stability
more difficult to unbalance an object
lower stability
easier to unbalance an object
define balance
ability to control equilibrium
define static balance
a person being in control of their body position once stationary
eg. gymnast in handstand
define dynamic balance
a person in control of their body position whilst moving
eg. a netballer moving with speed or control on the court
define centre of gravity (COG)
a body’s centre of gravity is the central point which all weight is evenly distributed and balanced.
where is COG usually found
close to the belly button
base of support
the greater the base of support, the greater the stability of an object
define line of gravity
an imaginary line that passes through the COG and continues down in the centre of an object’s base of support
