Energy Flashcards
Kinetic Energy formula
K = 1/2m(v^2)
gravitational potential energy
U = mgh
elastic potential energy
U = 1/2k(x^2)
k is spring constant
x is magnitude of displacement
total mechanical energy
E = U + K
conservative forces
path independent that do not dissipate energy
nonconservative forces
- the work done by the non conservative force is exactly equal to the amount of energy lost from the system like as heat
total mechanical energy of a conservative system
ΔE = ΔU + ΔK = 0
total mechanical energy of a nonconservative system
W nonconservative = ΔE = ΔU + ΔK
work formula
W = F • d = Fdcosθ
θ between force and displacement vectors
Power
rate at which energy is transferred from one system to another
P = W/t = ΔE/t
watt (W) = J/s
work-energy theorem
Wnet = ΔK = Kf - Ki
mechanical advantage
MA = Fout/Fin
Fout: energy exerted by a simple machine
Fin: force actually applied on a simple machine
technically dimensionless
work in relation with pressure and volume
W = PΔV
two-pulley system displacement distance
to lift an object to a certain height in the air one must pull through a length of rope equal to twice that displacement
work output efficiency
Efficiency = Wout/Win = (load • load distance)/(effort • effort distance)
