Chapter 2- Work And Energy

Question 1

Gravitational potential energy

Answer 1

mgh

g- acceleration due to gravity
h- height of object

Question 2

Spring potential energy

Answer 2

(1/2) kx^2

k- spring constant (how stiff it is)
x- displacement from equilibrium

Question 3

Conservative forces

Answer 3

Path independent and don’t dissipate energy

Question 4

When is 🔺U = 0

Answer 4

When initial and starting heights are the same

Question 5

Two only ways energy can be transferred??

Answer 5

Work and heat

Question 6

Work

Answer 6

Fd cos(&)

Question 7

Isochoric

Answer 7

Volume stays constant

Question 8

For an isobaric process how do you calculate work?

Answer 8

W = P🔺V

Question 9

Power

Answer 9

W/t or 🔺E/t

Question 10

Units for power

Answer 10

Watts (W) = J/s

Question 11

Work energy theorem

Answer 11

W = 🔺K

Question 12

Mechanical advantage ratio

Answer 12

Fout/ Fin

Fout- force exerted on object by simple machine
Fin- force actually applied on the simple machine

Question 13

How does a pulley system work?

Answer 13

You have to pull it a longer distance but it’s easier to pull

Question 14

Efficiency equation

Answer 14

Wout / Win = (load)(load distance) / (effort)(effort distance)