Biomechanics Principle Flashcards
What is Newtons first law
Law of inertia- a body will remain in a state at rest unless acted upon by a external force
what is Newtons second law
law of acceleration- the acceleration of a body is the same to the size of the force applied and takes place in the same direction
what is Newtons third law
law of reaction- the reaction force is equal in size and opposite in direction to the action force
definition of a force
a push or pall that tends to alter the state of a body
if forces work together the effect is combined
if act against it has a cancelling effect
what forces act on a body when it is vertical force
- weight
- reaction force
what forces act on a body when it is horizontal force
- friction
- air resistance
definition of centre of mass
the point at which a body is balanced in all direction
what is centre of mass affected by
- shape
- density of different parts of the body
what is stability
a measure of how easily a body is moved from a position of balance
definition of a balanced force
when two or more forces acting on body are equal in size but opposite in direction
definition of a unbalanced force
when two or more forces acting on a body do not cancel out
definition of net force- resultant force
the overall force acting on a body when all forces are considered
factors affecting friction
surface area
weight
temperature
how can friction be maximised
- increase roughness surface
- increase mass
- increase temperature
factors affecting air resistance
velocity
frontal cross sectional area
streamlining and shape
surface characteristics
