Linear Kinetics Flashcards
Ligma
Define Bio mechanics
The study of motion and the effects of forces relative to the body
What does biomechanics apply
The laws of mechanics and physics to human performance
Linear Kinetics Defo
Concerned with motion that occurs in a straight line
Angular kinetics defo
Concerned with motion that occurs around an axis
Define Force
The pushing or pulling effect one body can have on another body
What does force do to objects
Make objects stop moving/move, change their speed,direction
Where are forces found
Internal: Muscles and tendons
External: Air/water resistance, gravity, friction
Force-motion
The application of force to create motion
Velocity
The rate of the positional change of an object
Acceleration
The rate of change in velocity
Mass
The amount of matter contained within an object or body
Body
Refers to a human body, another object or a surface
Friction
The force that opposes the efforts of one body to move over another
4 types of friction
Static: Between objects that are not moving
Sliding: When two objects slide over each other
Rolling: When an object rolls over another object
Fluid: Friction caused by water/air
Inertia
The amount of resistance to change an objects state of motion
Newtons 1st Law
Inertia: A body at rest or in motion will stay at rest or in motion unless acted upon by an external force
Newtons 2nd Law
Acceleration: The rate of acceleration of a body is proportional to the force applied to it, and inversely proportional to the mass of the object
Newtons 3rd Law:
Action-Reaction: For every action there is an equal and opposite reaction
eg of 1st law creating movement (golf)
Golf ball remains on the tee unless force is exerted on it
Eg of 1st law changing movement (golf)
Once hit, the ball would travel forever if no forces were acting to stop it moving
What forces stop a golf ball moving (1st law example)
Air resistance- slows it down
Gravity: Pulls it down
Friction: Stops it rolling
Eg of 2nd law (sprinting)
If 2 sprinters apply the same force to a starting block the one with less mass will accelerate faster
Eg of 3rd law (swimming)
Swimmer diving of the blocks pushes on the kicker and the kicker applies the exact same back to the athletes foot
Eg of 2nd law (golf)
A small force applied to a ball using a putter results in slow acceleration
