Linear Kinetics 2 Flashcards
Elastic collision definiton
Kinetic energy of the system is conserved (uncommon)
Inelastic collision definition
Kinetic energy is transferred to another form of energy
What factors effect the outcome of collisions
Mass and Velocity
Momentum equation
P = M x V
P = momentum kg/m/s-1
total momentum of system = ??
Sum of momenta of all the particles in the system
What is the link between momentum & Newtons 1st law
Momentum of system is conserved unless a resultant force acts upon it
Total system momentum is conserved (equation)
Momentum before the collision = momentum after the collision
Equation for final velocity of a collision
V = total momentum / sum of masses of objects
Change in momentum equation
Change in P = Mass x change in velocity
What is the link between momentum and Newtons 2nd law (force equation)
Force = change in momentum / time
Because change in momentum is mass x velocity which = rearranged from acceleration in the 2nd law equation
Impulse equation
Force (N) x time (s)
Impulse equation (momentum & 2nd law rearranged)
Impulse (Ns) = change in momentum = mass x change in velocity
Impulse is equal to the change in momentum
How can an impulse be increased
Increase force
Increase time over which the force is applied
What are negative and positive horizontal impulse during running
Negative - braking
Positive - propulsion
Total net impulse during a running stride (equation)
Total net impulse = positive + negative impulse
