biomechanics Flashcards
(50 cards)
On a free body diagram, where is the arrow representing AR placed
Centre of mass backwards
Friction is affected by what factors
Surface characteristics and surface temperature
How do surface characteristics affect friction
A smooth surface reduces friction whereas a rough surface increases it
Define stability
The ability of a body to resist movement
define fluid mechanics
the study of objects that travel through fluid
if AR=F what is the net force
0
If AR>F, what is the net force and direction of movement
Negative, Forwards
On a free body diagram, where would the arrow for weight be placed and in what direction
From the centre of mass, downwards
Define Centre of mass
The point at which a body is balanced in all directions
On a free body diagram, where would the arrow for reaction be placed and In what direction
Points of contact with the floor upwards
On a free body diagram, where would the arrow be placed representing friction
Points of contact with ground forward
Define friction
The force that acts in opposition to the movement of one surface on another
What is air resistance
The force acting in the opposite direction of a moving body in air
On a distance time graph what does a straight horizontal line represent
stationary
define drag
the resistance to motion of a body travelling through fluid
what direction does drag travel in
in the opposite direction to movement
Unit of measurement used for weight
Newtons
state 3 factors affecting air resistance
velocity of moving body
cross sectional area
shape and surface characteristics
how does velocity affect air resistance
greater velocity= greater air resistance
Define reaction force
For every action, there must be an equal and opposite reaction
Where is the fulcrum positioned in a first class lever
the middle
What is positioned in the middle of a second class lever
load
What is positioned in the middle of a third class lever
effort
what is an aerofoil
a streamlined shape with a curved upper surface and a flat under surface
