Aerodynamics

Today in class, our assignment was to make a glider that would be able to hold an egg. Our objective was to have the glider glide down when thrown from the school roof and still keep the egg from breaking. Our success was mostly protecting the egg, as the gliding factor wasn't as important towards success. It was just a helping factor. For this task, we were given a sheet of metro newspaper, 25 straws, and a table length strip of tape. The way we build ours, we made an arrow shaped glider that had the eggs attached to the mid front bottom of the glider surrounded by straws to create a basket for the egg. We use some of the other straws to build a structure of the glider which would be covered by the newspaper to catch the wind.

Graphs fromt he Lab

Here are the result from the graph we tried to walk

Distance Vs. Time Graph

 

Distance Vs. Time Graph

 

 Distance Vs. Time Graph

 

Velocity Vs. Time Graph

 

Velocity Vs. Time Graph

 

 

Walking the Graph

In class, we had to walk a time vs distance graph and a velocity vs time graph. The distance vs time graph was easier to walk because it measured on how far you are from the sensor. The velocity graph was hhow steady you walk. It took as a few tries for the distance graph to try to get a close to perfect one and it took us many many tries for the velocity vs time graph. The graph for that is still less acurately walked then the distance vs time graph

Right Hand Rule 1 and 2

Right-Hand Rule #1: This rule states that around a conductor, when one wraps his right hand around, the thumb points to the direction of conventional current flow and the fingers point in the direction of the magnetic field. 

 

Right-Hand Rule #2: This rule states that around a solenoid, or electromagnet, when one wraps his right hand around, the thumb points in the direction of north, (magnetic field) and the fingers point in the direction of conventional current flow.

 

Concept Map

In physics we made a concept map for electricity. It shows all the different terms related to electricity and shows how each of them are connected to each other. This is really helpful if you are a visual learner.  The photo above is a photo of the group whose map was the most clear and readable.

1) Kirchhoff's Law:

For Series:

Current:

It = I1 = I2 = I 3...=In

Potential Difference:

Vt = V1 + V2 + V 3...+Vn

Resistance:

Rt =R1 + R2 + R 3...+Rn

For Parallel Circuit:

Current:

It = I1 +I2 + I 3...+In

Potential Difference:

Vt = V1 =V2 =V 3...=Vn

Resistance:

1/Rt =1/R1 + 1/R2 + 1/R 3...+1/Rn

 

2) Power :  P=VI or P= E/t

3) Conventional Current: the flow of charge from positive terminal to negative terminal

4) Electron flow: the flow of electron from negative to positive terminal.

5) Ohm's Law: R=V/I

6) Current is the amount of charge passed through a point at a given time.

7) Voltage is the potential difference from point A to point B.

8) Finding a slope is rise/run

9) Energy: E=Pt

10) Parallel Circuit: charge flows along two or more paths.

Ohm's vs Kirchoff's Law

Ohm's Law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them.
Given Ohm's triangle....

V= IR

I = V/R

R= V/I

Kirchoff's Law implies that At any junction in an electrical circuit, the sum of currents flowing into that junction is equal to the sum of currents flowing out of that junction. 

or

The algebraic sum of currents in a network of conductors meeting at a point is zero.

Series Circuit:

Current:

It = I1 = I2 = I 3...=In  

 Potential Difference:

Vt = V1 + V2 + V 3...+Vn

Resistance:

Rt =R1 + R2 + R 3...+Rn

Parallel Circuit:

Current:

It = I1 + I2 + I 3...+In

Potential Difference:

Vt = V1 = V2 = V 3...= Vn

Resistance:

1/Rt = 1/R1 + 1/R2 + 1/Rt3...+1/Rn

Top 3 Roller Coasters

1. The Kingda is an exciting roller coaster because it is the tallest roller coaster at 456 feet! It is located in Six Flags  The top speed on this coaster is 128mph. It's a simple coaster with one giant hill.

2. The new Formula Rossa is my next favourite because it currently holds the record for fastest steel roller coaster at 149.1 mph! It is a ferrari themed coaster so it goes with the record title.

3. This next coster features the tallest vertical loop at 145 feet. It's called the Superman: Krypton Coaster. It is locataed in Six Flags Texas.

Electron Flow vs Conventional Current

Current is a flow of negatively charged electrons repelling one another. It use to be thought that the current flow was moved from the positive end to the negative end, but studies show it's actually the opposite.

Electron Flow
An electron flow is a movement of electrons in a circuit. The electrons are moving
from the negative to the positive side of the circuit. 

Conventional Flow

In a conventional flow, the electrons are moving from the positive to the negative side of the circuit.

Energy Ball

Last Friday, we were able to run tests on a ping pong shaped object that had a circuit inside with a light bulb. In a group of four, we were given questions to answer relating the circuit. Questions relating to how the light bulb would light and would it light with more than one person connecting the circuit. The "ping pong ball" had two metal strips on the side, and in order to light the bulb, you had to touch both strips. Our fingers acted like a conductor. The light bulb will then light up, and make a noise.

We then had one person touching one strip, the next person touching the other person's hand, and another person touching the hand of the last person, until the 4th person touched the third person's hand with one hand and the remaining metal strip with the other hand. This allowed the circuit to be complete.

Our big next task involved the whole class to work together. Our objective was to make a parallel circuit with two light bulb and a switch to turn off one light bulb when needed. In order to do this we connected people in a circle with the light bulb on opposite ends. Then had a line of people in between the light bulb. A parallel circuit is like having two circuits that are connected to one another.

In a series circuit, if a component of the circuit burns out, then the rest will not work and the circuit will not be complete. If a component in the parallel circuit burns out, the rest will still work.

PARALLEL CIRCUIT

   SERIES CIRCUIT