Resistance Lab

Purpose:
The purpose of this lab was to determine what the resisatnce was, of a resistor we know nothing about.

Materials:
DC Power Supply
Galvanometer
Reistor
Conductors

Procedure:
First we created a circuit with the DC power supply, resistor and the galvonometer. Then sent different amounts of vvoltage through the circuit and read the corresponding current.

Data:

picture lab

Data Analysis:

Line of best fit: y=100000x+.5

Slope=Resistance= 100000W

Because Ohms law is R=V/I, I plotted these units accordingly and it made the slope become the resisqatance, which is 1000000W

Conclusion:

In conclusion we used our data that we recieved from our lab to make a graph plotting voltage and amps.  The resulting slope was then used to calculate what the resistance of our resistor was, which was determined to be about 100000W

 

 

 

 

Electrostatics Exploration 4

In this lab, I slid my body across a classroom chair and gave it a negative electric charge. This occured because electrons that reside on the chair were rubbed off on my body causing a negative electric charge.  I then placed my finger inside a Faraday pail and used a charge sensor to determine how much charge it had.

image (1)

When my finger was placed in the Faraday pail, the reading was consistantly around 5.1 nanocoulombs.

image

When I removed my finger from the pail the reading was near .18 nano nanocoulombs.
image2

I believe that the purpose of the cage is to act as a shield against the postive and negative charges that may be interacting inside the enviroment in which the test occured.  I could test this by sending a charge aimed at the center of the cage, and the measuring the charge that occurs inside that cage. The result would make the charge inside the cage unchanged because the cage absorbed all of it.

Circular Motion and Gravity Lab

Purpose:

To design an experiment to determinethe magnitude of the force keeping a toy car in circular motion.

Matireals:

Ring stand

Toy Car

Stopwatch

Meter Stick

Triple Beam Balance

String

Procedure:

1. Determine the weight of the car using the triple beam balance

2. Find the length of the radius of the string

3. Determine the circumference of the circle that the car travels by using the correct formula

4. Use the centripetal force formula to find the amount of force that is keeping the car in motion.

Data & Data Analysis:

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Conclusion:

Through using the given formulas I was able to determine that the velocity that was keeping the car in motion was .128 N. Some errors in the experiment that may effect the data include, slow reaction time on the stop watch, and how the battery of the car was drained after multiple uses.

 

I-Newts Lab

Purpose: to determine the inertial mass of a moving object using the relationship between force and acceleration.

Materials:

Pasco cart with launcher and Pasco track

LabQuest Hand-held Processor with Motion Detector probe

Procedure:

1. Place the cart on one end of the track with launcher.

2. Place the motion detector at the opposite end of the track. Be sure the motion detector is set

for recording small objects. Your teacher can show you how to choose this setting. Attach

the motion detector to the LabQuest unit in the digital/sonic port. The pre-established time

sampling set-up should work well for this lab and will not need adjustment.

3. Retract the launch to the one-centimeter position and prepare to release the trigger.

4. Coordinate with the person performing operating the LabQuest. Pull the trigger and begin the

LabQuest so that the motion detector records the almost the entire travel of the cart.

5. The LabQuest graphing function will record velocity versus time for the trial. Find the portion

of the graph that corresponds to the cart’s travel and determine the acceleration from the

graph during this time. Record the acceleration in the data table.

6. Repeat these steps with the launcher at the 2-cm, the 3-cm, and 4-cm settings.

Data Analysis: gyjjyh

The Conclusion: Our purpose was to determine the inertial mass of a moving object using the relationship between force and acceleration, we accomplished this by finding how the acceleration increased as the force increased. It then became obvious that as the force increased, so did the acceleration of the object.

Car Crash Investigation (Collision Expert)

My Presentation to the mayor: http://i.imgur.com/WNaesNa.png

 

After receiving the data from the Auto Expert, I was able to determine the initial velocity of the SUV before impact with the wagon. Using the equation,

(Initial Mass(SUV)Initial Velocity(SUV))+(Initial Mass(Wagon)×Initial Velocity(Wagon))

=

(Final Mass(SUV)×Final Velocity(SUV))+(Final Mass(Wagon)×Final Velocity(Wagon))

After these calculations I found that the SUV was traveling 10.83 m/s or 39 km/hr. It is with this data that I conclude that from this inelastic collision I can prove that the driver of the SUV was in fact going over the predetermined speed limit. My data is below

 

 Image

CSI Physics: Gangster Shooting Forensics Lab

After much review and several very complicated math and physics equations, my professional conclusion is that Janice Jackson shot Leafbottom with a .38 Special.Through much examination and help from the doctors ,we found the appropriate measurements to make it possible to prove who is guilty. First using the physics formula Yf=.5(a)(t^2) I determined that the time it took for the bullet to travel from the exit wound was approximately .3355s. Then using the distance given to me from the doctor and the police officers, I used the distance over time formula to solve for the velocity of the bullet. This happened to by approximately 90 m/s, which coincides EXACTLY with the muzzle velocity after impact of the .38 Special that Janice Jackson shot Leafbottom with. The math is flawless (see below) and the evidence speaks for itself, the shooter was Janice Jackson.IMG_2355-1

Free Fall Acceleration: Step 3

Distance fallen (change in y): .16 meters

Calculation:
delta y = v-initial * t + 1/2 *a*t^2
-0.16 m = 0 + (1/2)*(-9.8 m/s^2) * t^2
-0.16 m = 0 + -4.9 * t^2
.03265 = t^2
.18 = t

Since the average reastion time is .25s, and my reaction was .18, I was .007 faster than the average reaction time.