Biomechanics, leers and technology Flashcards
(16 cards)
What is Newton’s 1st law?
Body remains in state of rest or uniform velocity unless acted upon by an external/unbalanced force
What is Newton’s 2nd law?
Body’s rate of change of momentum is proportional to size of force applied ans acts in same direction
What is Newton’s 3rd law?
Every action has an equal or opposite reaction
What is velocity and it’s equation?
Rate of change of displacement
velocity = displacement/time
What is momentum and it’s equation?
Quantity of motion processed by moving body
momentum = mass x velocity
What is acceleration and it’s equation?
Rate of change of velocity
acceleration = (final-initial velocity)/ time
What is force and it’s equation?
Push or pull that alters state of motion of body
force = mass x acceleration
What are the 2 types of force?
External force = comes from outside the body
Internal force = generated by skeletal muscle
What affect can force have on the body?
- creates motion
- accelerates a body
- decelerates a body
- changes bodies direction
- changes bodies shape
What is net force?
Sum of all forces acting on a body
0 = no change in motion
What factors affect fricton?
- roughness of ground
- roughness of contact surface
- temperature
- size of normal reaction
What factors affect air resistance?
- velocity
- shape
- frontal cross-sectional area
- smoothness of surface
What is centre of mass?
Point at which an object/body is balanced in all directions
What is stability?
Ability of the body to resist motion and remain at rest
What factors affect stability and how?
- mass of body = larger mass means greater inertia
- height of COM = lower COM means greater stability
- size of base support = greater size means greater stability (more contact)
- line of gravity = more central to base support means more stable
