## Friday, November 12, 2010

### 11/12/10

First, we went over a few things from yesterday that we didn't get to. We first talked about the homework from a few days ago having to do with the cart on the ramp. The whole process was as follows:

First, the spring sprang the car to the edge of the ramp.

Then, the cart fell off the ramp.

Next, we went over last night's homework. As a group, we had to write our idea of an example of the following: Positive work that causes an increase in the elastic potential of the system. We had these ideas:

---Slinghot Number Sentence: 5+4=9

---Rubber band Number Sentence: 5+4=9

Mr. Finley's: Kinetic to Elastic

System: Person, Trampoline
His situation: A person speeding down very fast onto a trampoline that stretches.
20 Jewels= 20 Jewels
Jewels: A unit for energy

JP table idea: Gravitational potential energy in the system is converted to internal energy
A rock is pulled down on a rubber band.
System: Rubberband, Person, Rock
gravity+ -2 gravity+ 2 elastic= 2 elastic

MP table idea: Positive work to kinetic energy
Person pushing a cart
0 units+ 2 units
System= Surface where cart is pushed

DB table idea: Positve work to gravitational energy of the system
A ball falling off of a table
Couldn't come up with an equation
System: Ball

AL table idea: Gravitational potential energy in the system is converted to internal energy.
When meteorites get pulled to earth, they warm up as they go through the atmoshpere.
5 unites of energy+0 units of energy= 5 units of converted energy.
The earth/atmosphere does the work

JF table: Kinetic coverted to grav. potential energy
A kid climbing up a diving board ladder but not jumping up
3+2 +-5+6=6