Loading in 5 sec....

EPE – Calories- Law of Conservation of Energy and Work-Energy TheoremPowerPoint Presentation

EPE – Calories- Law of Conservation of Energy and Work-Energy Theorem

- 108 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' EPE – Calories- Law of Conservation of Energy and Work-Energy Theorem' - soleil

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### EPE – Calories-Law of Conservation of Energyand Work-Energy Theorem

Another type of PE is…Elastic Potential Energy( EPE)Energy stored in an obj. at its stretched or compressed state.Obj. will return to its original or relaxed length.

Elastic Potential Energy

- EPE or Uel = ½ k x2
EPE - elastic potential energy, J

- k - spring constant- STIFFNESS, N/m
(indicates how easily a material stretches or compresses

‘higher k stiffer material’

- x – the distance the spring is stretched or compressed
from relaxed length ( x = ℓs - ℓr ) or ( x = ℓr - ℓc )

( ℓr = relaxed length )

( ℓs = stretched length ) or ( ℓc = compressed length )

So, Where do Calories fit in w/Energy?

- Work can’t be done w/out _____________.
- The unit for Energy is ______________.
- The UNIT of HEAT ENERGY is calorie.
- It is = to 4.18 J ( Note the small “c” )
- A calorie is the heat necessary to raise the temperature of 1 g of water 1°C.
- The UNIT for FOOD ENERGY is Calorie.
- (Note the Big “C” )
- 1 Calorie = 1000 calories

Law of Conservation of Energy

- Energy cannot be created nor destroyed, only changed to another __________.
- Same as the Law of Conservation of Mass
- Mass/ Matter in a closed syst. cannot be created nor destroyed only conserved.

Law of Conservation of Energy states..

The total energy of a closed,

isolated system is constant

KE1 + GPE1 + EPE1 = KE2 + GPE2 +EPE2

OR

½ mv12 + mgh1 + ½ kx12 = ½ mv2 2 + mgh2 + ½ kx2 2

OR

GPE(t)op + KE(t)op = GPE(b)ottom + KE(b)ottom

According to the Work-Energy theorem,

the work done on an object, by the net

force acting on it, is equal to the change

in kinetic energy of the body

Work = Δ KE

F*d = KEf – KEi

F*d = ½ m vf 2 – ½ m vi2

F*d = ½ m (vf2 – vi2)

Work Energy Theorem-GPE

- When work is done, potential energy can also be changed.

Download Presentation

Connecting to Server..