5.2 Mechanical Energy

Course Menu
Chad's General Physics Master Course

Quizzes, Study Guides, Chapter Tests, Equation Cheat Sheets, and More!

youtube-video-thumbnail

Mechanical Energy

MECHANICAL ENERGY
Kinetic Energy KE = ½ mv2          SI unit = Joule
Gravitational
Potential Energy
PE = mgy             SI unit = Joule
Work-Energy
Theorem
Wnet = ΔKE
Work Done by
Nonconservative
Forces
WNC = ΔKE + ΔPE
Conservation of
Mechanical Energy
KEi + PEi = KEf + PEf

½ mvi 2 + mgyi = ½ mvf 2 + mgyf

Conservative Force - If the work done by a force in moving an object from one location to another is the same no matter the path, it is conservative. When only conservative forces act on an object, mechanical energy is conserved.

Noncoservative Force - A dissipative force which results in a loss of mechanical energy often to heat or sound. Kinetic friction and air resistance are common examples.