# leahmaew

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## Posts posted by leahmaew

### Determining Maximum Height Lab Deliverable

Katrina, Leah, and Holly. This method had such a high percent error for us because of the gap between actually time and when the stop watch was hit. Another factor that could cause the high percent error is when knees are bent, it makes the time longer because of the effort needed to bend down, then jump up. smaller times are more accuature because it is the actual time in the air, the distance found through equations were so much greator because our times were when leaving the ground, and not simply in the air. therefore there are many

factors that can contribute to such a high percent error. to eliminate this large gap we could not bend knees. and rec ord the time feet are actually in the air.

### Kinematics and Gravity Lab: Determining G/ Determining Maximum Height

The young physicists, Katrina Bruzda, Holly Ferguson, and Leah Warner have calculated the acceleration due to gravity in a new manner! Check this out: they used a soft red ball, and a meter stick and a lovely red stop watch to calculate the acceleration of the red ball. Starting out these girls knew the acceleration due to gravity on earth is 9.81 m/s squared, and they set out to prove this theory true. To do this, each time they set the red ball at the top of the meter stick and recorded the time it took the ball, from the time it dropped to the time it hit the floor. Knowing this new data and the initial velocity of 0 m/s, meaning an object at rest, they could then calculate the acceleration due to the gravity of this lovely red ball. We did 5 trial runs to ensure that they collected the perfect data. With their five trials they calculated the acceleratino using the equation (d=vit+1/2at2) and they substituted each time in for this equation and calculated acceleration for each time trial. And then they averaged each of the accelerations to be 7.52 m/s squared, proving a 23.3 percent error apposed to the 9.81 m/s squared value. Althought their one acceleration of 9.45 was very close to the accepted value, sadly their average of all trails didn't add up to euqal the same thing. The 9.45 trial was very beneficial because we were able to witness the actual physics.

### Speeding Lab

Leah, Katrina, Holly, Sarah 9/11/12

Speeding Lab

1.In the speeding lab, we were measuring the speed of cars to see if cars were going over the speed limit, which was 35 mph or 15.6 meters per second. The project was to come up with an experiment to find out how many cars were speeding on the road in front of our school. We needed to find a way to gather information so accurately determine the amount of cars speeding.

2. - We took a tape measure, a stop watch and used to rocks at spot markers.

- We marked the beginning of the 30 meters with a rock and had one person stand there with a stop watch

- We marked the end of the 30 meters with another rock and had a second person stand there,

-We communicated which car we would be timing, by having the person at the beginning of the 30 meters begin the stop watch and raising their arm to let the person at the end of the 30 meters know which car. When said car passed the marked spot at the end of the 30 meters the person would raise their arm to indicate to the first person to stop the timer.

-The person with the timer told the two recorders what the time was and they recorded it.

-We repeated this procress for 10 different cars.

- After collecting data for 10 cars we changed the tap measurement to 50 meters and did the same thing for another 10 cars.

-Collected data for 10 cars

3. 4 and 5

[TABLE="width: 320"]

[TR]

[TD]Car#[/TD]

[TD]Distance[/TD]

[TD]Time[/TD]

[TD="colspan: 2"]Speed (m/s)[/TD]

[/TR]

[TR]

[TD="align: right"]1[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]1.8[/TD]

[TD="align: right"]16.66667[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]2[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.53[/TD]

[TD="align: right"]11.85771[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]3[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.09[/TD]

[TD="align: right"]14.35407[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]4[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.3[/TD]

[TD="align: right"]13.04348[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]5[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.64[/TD]

[TD="align: right"]11.36364[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]6[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]1.87[/TD]

[TD="align: right"]16.04278[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]7[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.09[/TD]

[TD="align: right"]14.35407[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]8[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]3.05[/TD]

[TD="align: right"]9.836066[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]9[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.4[/TD]

[TD="align: right"]12.5[/TD]

[TD][/TD]

[/TR]

[TR]

[TD="align: right"]10[/TD]

[TD="align: right"]30[/TD]

[TD="align: right"]2.17[/TD]

[TD="align: right"]13.82488[/TD]

[TD][/TD]

[/TR]

[TR]

[TD][/TD]

[TD]Average[/TD]

[TD="align: right"]2.294[/TD]

[TD="align: right"]13.38434[/TD]

[TD][/TD]

[/TR]

[/TABLE]

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