Work, Energy and Power

What is work done?

product of the magnitude of the force and the distance moved by the object in the direction of the force

What is the principle of conservation of energy?

in a closed system energy cannot be created or destroyed

What is work done equivalent to?

energy transfer

How to derive kinetic energy equation?

v²=u²+2as u = 0

s = v²/2a W = Fx

Fv²/2a = W F = ma

E = 1/2mv²

How to derive GPE?

W = Fx

F = mg x = h

E = mgh

Describe energy change between E_k and Ep

in a closed system, EK max = EP max.

What is power and its formula?

rate of energy transfer, P = E/t

Equation for power required to move an object at a constant velocity?

P = W/t

P = Fx/t

P = Fv

What is efficiency?

useful output energy/total input energy