Length of Balloon (0.1cm)
Trial:
Time: Seconds (0.1cm)
30
1
2.0
30
2
2.1
30
3
1.9
30
4
2.2
30
5
1.8

mean:
2.0

Displacement (meters and centimeters) (1)
Work (0.1)
Power (0.1)
11 m, 18 cm
559
279.5
11 m, 32 cm
566
269.5
10 m, 33 cm
516.5
271.8
11 m, 32 cm
566
257.3
10 m, 32 cm
516
286.7
10 m, 89.4 cm
544.7
273.0

Veloctiy (m/s)
Displacement/Time
Acceleration (m/s/s)
Velocity/Time
Trial 1
11.18/2.0 = 5.59
5.59/2.0 = 2.80
Trial 2
11.32/2.1 = 5.39
5.39/2.1 = 2.57
Trial 3
10.33/1.9 = 5.43
5.43/1.9 = 2.90
Trial 4
11.00/2.2 = 5.15
5.15/2.2 = 2.34
Trial 5
10.32/1.8 = 5.73
5.73/1.8 = 3.18
Mean:
5.46 2.76 Force = 0.003 x 2.76 = 0.008 Newtons.
Hypothesis: If I let go of the balloon with air in it then the can with move forward.
Dependent Variable is Distance.
Independent Variable is Different Surface.
Controlled Variable is same amount of air that goes into the balloon, the person who blew up the balloon, and the same soda can.
The balloon accelerated very quickly at the beginning as the air was rushing out of it quickly. However, as the amount of air decreased, so did the rate at which the balloon moved. If the string was not held tightly, the balloon bounced around quite a bit and did not travel as far.
In this lab, I was examining the amount of power and work that was done by the balloon as it travelled. But was the balloon efficient? Efficiency means the “ratio of useful work out from the total amount of work done, as a percentage.” Therefore, if there are a lot of energy transfers, this means that the lab is not efficient. For example, on the balloon's motion, there are points where energy is lost. When the balloon is moving, the friction between the string and straw causes heat, and thermal energy. Another example is the sound energy created during the movement of the balloon, the energy has been lost. In order to improve this and make it more efficient, perhaps we could use a string that created less friction and then would result in a faster balloon and less thermal energy. This could also effect the amount of sound energy. If this friction could somehow be reduced, then the balloon would be ten times more efficient because less friction means less heat, and less heat means less energy transfers and less energy lost.
In the lab, I used the assumption that