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Bellwork

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.

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Bellwork

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  1. 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.

  2. Conservation of Energy and the Egg Drop Project 1/16/14

  3. 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

  4. PE = 10000 J KE = 0 J PE = 7500 J KE = ? PE = 5000 J KE = ? PE = 2500 J KE = ? PE = 0 J KE = ? PE = 10000 J KE = 0 J PE = 7500 J KE = 2500 J PE = 5000 J KE = 5000 J PE = 2500 J KE = 7500 J PE = 0 J KE = 10000 J

  5. 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!

  6. 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

  7. Energy Relationships

  8. Equation • Work and Kinetic Energy

  9. 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

  10. 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)

  11. 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

  12. Today • Finish the lab • Work on the homework assignment • Work on project analysis

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