Work, energy power

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PY1010 semester 1

Last updated 3:38 PM on 5/3/26
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10 Terms

1
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work performed in moving object some distance x by applying some force F

W = Fx

Work is pos or neg (J)

2
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power

P = (ΔW)/(Δt)

3
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Energy definition

ability to do work (J)

4
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Gravitational potential energy

ΔEpot = mgh

5
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Kinetic potential energy

EK = ½ mv²

6
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Absence of friction initial & final configurations

Einitial - Efinal = 0

7
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Object undergoing freefall w/o friction

EK,1 + Epot,1 = EK,2 + Epot,2

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Object initially not moving

EK,2 = -(Epot,2 - Epot,1)

9
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kWhr unit of energy

E = (1000W)(3600s) =3×10^6 J

10
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1 calorie is

4.186 J