fmechs
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coefficient of friction equation
F max = uR
momentum equation
momentum = mass x velocity
what is the impulse?
the change in momentum
impulse equation
impulse = force x time
what fact does conservation of momentum refer to?
total momentum before impact = total momentum after impact
in general, when is work done on an object?
when a force is applied to it and there is motion
work done equation?
work done = component of force in direction of motion x distance moved in direction of force
what does work done against gravity equal?
mgh
momentum=
mv
impulse=
change in momentum=Ft
if impulse of a on b then which change in momentum needs calculated?
b
conservation of momentum
total momentum before impact=total momentum after impact
kinetic energy =
1/2 m v^2
potential energy =
mgh
value of g for mechanics
9.8
principle of conservation of mechanical energy
when no external forces (other than gravity) do work on a particle during its motion, the sum of the particles kinetic energy and potential energy remains constant
work-energy principle
change in total energy of the particle is equal to the work done on the particle
what is power
rate of doing work
power =
Fv where F is the driving force
newtons law of restitution
speed of seperation/speed of approach = e
what is the constant e
coefficient of restitution
what is the range for e
greater than or equal to 0 and less than or equal to 1
if e = 1 is the collision perfectly elastic or perfectly inelastic
elastic
what happens if a collision is perfectly inelastic
particles coalesce on impact