scalar
reference
GPE=mgh
Gravitational potential energy
system
Nonnegative value
scalar
No nonconservative force do
work
unit
Potential energy
EPE=1/2kx^2
change of Kinetic energy
= -change of potential
energy
No nonconservative force work
KE=1/2mv^2
Mechanic energy
Elastic potential
MEi=MEf
joule
Kinetic energy
KE
Work
Joule
scalar
No negative value
Work-Energy principle
W=ΔKE
Wnet=Wc+Wnc
P=W/t
Power
Watt
scalar
W=Fdcosθ
scalar