Total Work = Fd Cos(θ)
KE = ½ mv2
Wnet = ΔKE = Δ½ mv2 = FnetdCos(θ)
PE = Potential Energy
ΔPE = mgh
A “Conservative Force” is once for which work depends only on the starting point and ending point.
We can define potential energy for any conservative force.
PEg = mgh
PEs = ½ kx2
Mechanical Energy = KE + PE
Conservation of Mechanical Energy
When only conservative forces act then:
KEI + PEI = KEf + PEf
Or KE + PE = constant
KEi + PEi + Wnc = PEf + KEf
Wnc = ΔKE + ΔPE
Conservation of Energy
Other forms of energy -> electric, chemical, radiant, nuclear & thermal.