Van Der Graaff

The Van Der Graff generator is a motorized object that charges object up to high voltages. When you place the aluminum pie plates on top of the generator they all receive the same charge and so they repel. A Van de Graaff generator is a device designed to create static electricity and make it available for experimentation. There are two types of Van de Graaff generators: one uses a high-voltage power supply for charging and one that uses belts and rollers for charging.

Final Cardboard Chair

Cutting out main chair foundation..

Excess Cardboard..

Double checking measurements..

Testing foundation with excess cardboard supports..

Cutting out final main 8 inch cardboard supports..

Cutting out final 4 inch cardboard supports..

Cutting out final 3 inch leg supports..


Cutting out final 5 inch chair back supports..

Model chair and actual chair measurements.

Testing chair before final back 3 inch leg supports are added.

Chair progress

Our legs to support the chair

Cardoard Chair Progress

We're making progress on our cardboard chair. We are testing out the idea of having cylindrical legs for the chair.

Kochs Law Lab Report

https://docs.google.com/open?id=0B7dQuiyiP5a-YjVjMzJjMzEtNWFmMS00ZmFmLWEwMjgtZDQ0Y2JmZGVlODJl

In this lab, we used equations and measurements to find the oscillation period and the force constant.  We used the following tools:
meter stick
weights
a spring

We also used the following equations:
PE=1/2KX^2
KE=1/2MV^2
PEg=MGH

First, we measured the spring displacement, the mass, and the time it took the spring to complete ten oscillations.  It took 8.5 seconds to complete ten oscillations, the mass was 55 grams, and the displacement was 14 cm.  After we found the gravitational potential energy, we used that to find the force constant, using our formulas.    We found that the time period for one oscillation is 0.85 seconds, and the force constant is 77.

Force

Materials:
Long piece of regular wood
a short piece of wood covered with sand paper on one side.
a protractor
caculations
Procedure:
We figured out at what angle the short peice of wood would slide down the long piece of wood on the smooth side. We also figured out the angle at which the sand paper side of the wood slid down the long piece of wood.
Results:
With the block weighing 160 grams. the regular board slide down the long piece at the angle of 22 degrees. the sand paper side of the block slide down the long board at an angle of 72 degrees.

Click link for work
https://docs.google.com/document/d/1xPdwACqlIdCP_0ZQ4-FrxPAk6dEnwGxpLNv5Sbfcl8M/edit?hl=en_US#

Inertia Trick

For our interita trick we are going "The Egg Drop Trick"

Procedure:

Fill a large glass about three-quarter of the way with water. Center a pie pan on the top of the glass. Center a cardboard tube (from paper towels or toilet paper) over the cup, in the pie pan. Finally, rest a raw egg on the top of the tube.
The glass, pie pan, tube and egg are at rest. With a quick striking motion, shove the edge of the pan so that the pan and the cardboard tube fly out of the way. The force is exerted on the pan and the tube, but not the glass or the egg. The glass will stay right where it is. Without support, the egg will succumb to the force of gravity and drop right into the cup.