Linear Kinetics 5 Flashcards
what does newtons gravitational law tell us
greater mass means greater force of attraction
greater distance between means less attraction
requirements for balance
contact point is in the middle of an evenly weighted object
what is the line gravity?
a vertical line through the point at which the object would balance
centre of gravity defintion
the point about which gravitational force is balanced - resultant force acts though it and mass is equally distributed around it
how does gravity interact with the bodies centre of gravity
tend to cause rotation about our bodies centre of mass
what factors influence the centre of gravity location
shade of body/object
position of limbs
distribution of mass
why does the Fosbury flop work?
because when mid flop the centre of mass is below the bar so with the same amount of force a higher jump height is achieved due to the curve of the flop
stability definition
resistance to linear and angular acceleration
to change
how to determine the centre of gravity (3 methods)
- balance method
- suspension method (line through CoG)
- reaction board
What factors influence stability? (base)
position of line of gravity to limits of base (greater base distance = ^ stability)
What factors influence stability? (height)
height of centre of gravity from the base (lower centre of gravity = ^ stability)
What factors influence stability? (weight)
weight of the body (^ weight = ^ stability
sporting examples of stability manipulation
judo, rugby tackling, weight classification sports
what happens when line of gravity moves outside an objects base
will lead to a fall eg surfing
why do sprinters & swimmers start in the position they do?
centre of line of gravity is close to edge of base allowing for rapid movement (acceleration) on ‘go’
