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 JKE = 0 J

PE = 7500 JKE = 2500 J

PE = 5000 JKE = 5000 J

PE = 2500 JKE = 7500 J

PE = 0 JKE = 10000 J

PE = 10000 JKE = 0 J

PE = 7500 JKE = ?

PE = 5000 JKE = ?

PE = 2500 JKE = ?

PE = 0 JKE = ?

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 Non-mechanical

Light Sound HeatKinetic Potential

Linear

Rotational

Gravitational

Elastic

Electric

Magnetic

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 ProjectCatchers 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