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Bellwork What is the conservation of energy? Lab due tomorrow (Fri. 1/17/14) Energy can not be created or destroyed, but it can be transformed from one form to another, the total amount never changes. Conservation of Energy and the Egg Drop Project 1/16/14 Mechanical Energy If there are no non-mechanical energies involved in a system, then mechanical energy can transform from one energy to another. PEint + KEint = PEfinal + KEfinal PE = 10000 J KE = 0 J PE = 10000 J KE = 0 J PE = 7500 J KE = ? PE = 7500 J KE = 2500 J PE = 5000 J KE = ? PE = 5000 J KE = 5000 J PE = 2500 J KE = ? PE = 2500 J KE = 7500 J PE = 0 J KE = ? PE = 0 J KE = 10000 J Mechanical and Non Mechanical Energies If there are non-mechanical energies involved in a system, energy is still conserved. PEint + KEint = PEfinal + KEfinal + TE (on formula card) Used in the lab! Conservation of Energy For objects falling or going down a hill Gravitational potential energy is being transferred into kinetic energy and thermal energy (if friction and air resistance is accounted for) PEint + KEint = PEfinal + KEfinal + TE Energy Relationships Energy – Flow Chart Energy Mechanical Kinetic Non-mechanical Potential Light Linear Gravitational Rotational Elastic Electric Magnetic Sound Heat Equation Work and Kinetic Energy Egg Drop Project Work Potential Energy (top) Kinetic Energy (bottom) no TE Velocity (bottom) Momenta (bottom) Force (bottom) Power to stop the egg Time (max) to stop the egg Egg Drop Project Catchers due next Tues. 1/21/14! Bring in, store bought, raw eggs if you want multiple tries. You can not modify the egg (face okay) Calendar Ahead Fri. 1/17 – Lab Due Tues. 1/21 – Egg Catchers Due Thur. 1/23 – H.W. Assignment Due Mon. 1/27 – Egg Project Analysis Due Wed. 1/29 – Test Review Due Thur. 1/30 – Energy Test Part 1 Fri. 1/31 – Energy Test Part 2 Today Finish the lab Work on the homework assignment Work on project analysis