Biomechanical Principles Flashcards
Define force
A push or pull that alters the state of motion of a body
- cause a body at rest to move
How do you calculate force
F = M X A
how are internal forces produced
By concentric muscle contraction
What are the external forces
Gravity
Air / water resistance
Friction
Ground reaction force
Define linear motion
All the body parts move in the same direction at a same speed along a straight or curved path
Define angular motion
The body rotates around a fixed point or axis (often rotational)
General motion
A combination of linear and angular motion eg cyclist
What is Newton’s first law
The body remains at rest in a straight line unless acted upon my an external force
Newtons 2nd law
Acceleration is directly proportional to the force applied (greater the force the greater the acceleration)
Newtons 3rd law
For every action there is an equal and opposite reaction
How do you calculate speed
S = D / T
Define momentum
The quantity of motion - a product of mass and velocity
Define velocity
The speed something is moving in a given direction
Define impulse
A product of force and the time it takes to apply the force
Calculate impulse
I = F X T
What is net impulse
The overall change in the momentum of the impulse
What happens if there is a larger positive impulse
Acceleration
Define stability
The ability of a body to return to equilibrium after being displaced
Define centre of mass
The point at which the body is balanced in all directions
An object with a larger base of support is more stable true or false?
True
Factors that effect stability
Mass of the object
Size of base support
Height and centre of mass
Points of contact
