week5-1 - (Some) Sources of Energy Energy Conservation If...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
(Some) Sources of Energy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/5/2012 2 Energy Conservation If we take a closed system, that is one that nothing can enter or leave, then there is a physical law that energy is conserved. We will define various forms of energy and if we examine the system as a function of time, energy may change into different forms but the total is constant. Energy does not have direction just a magnitude and units. Conservation of Energy follows directly from the statement that physical laws do not change as a function of time.
Background image of page 2
2/5/2012 3 Forms of mechanical energy Kinetic Energy: energy associated with the motion. Potential Energy : energy stored in a compressed spring or stretched elastic or in an object that is held at rest above the earths surface. To change the energy, one need to do some “WORK”. The amount of work is equal to the change of total energy.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Definition of Work We all need to do some work in order to accomplish something each day. More work is needed to carry 10 pizzas from Pizza Hut to your home than that for 1 pizza. (i.e. larger force is needed with equal distance) . More work is needed to drive yourself from Purdue to LA than that from Purdue to IND. (i.e. same force but longer distance ). Work = Force X distance
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/13/2012 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

Page1 / 18

week5-1 - (Some) Sources of Energy Energy Conservation If...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online