Equations in Physics Chapter 2

Question 1

Elastic potential energy, U?

Answer 1

U = 1/2 . k . x^2

Question 2

Total mechanical energy, E?

Answer 2

E = U + K

Question 3

Conservation of total mechanical energy (when only conservative forces are applied)?

Answer 3

Delta E = Delta U + Delta K = 0

Question 4

Work done by nonconservative forces, Wnc?

Answer 4

Wnc = Delta E = Delta U + Delta K

Question 5

How to calculate work when you are given the displacement and the force applied?

Answer 5

W = F. d. cos theta

Question 6

How to calculate work when to process is isobaric, but the volume changes?

Answer 6

W = P . Delta V

Question 7

How to calculate work when both the volume and the pressure change?

Answer 7

W = 1/2 . Delta V . Delta P + P2 . Delta V

Question 8

How to calculate work done by gravity?

Answer 8

W = Delta K

Question 9

How to calculate power from work or mechanical energy?

Answer 9

P = W / t = Delta E / t

Question 10

How to calculate mechanical advantage?

Answer 10

Fout / Fin

Question 11

How to calculate efficiency?

Answer 11

Wout/Win = load . load distance / effort . effort distance