Second Experiment With Robots

The objective of our second experiment with robots was to demonstrate the relationship between mass and accelaration (Newtown’s second Law), accelaration and power level, then power level and power, and finally battery drainage and mass. We program the robot with labview, and displayed the graph in microsoft excel.

First we kept the power constant, and changed the mass. We did three trials; the results are automatically record on a excel file. Here are the results we have got:
_ Trial 1
Power Level = 75,
Mass = 0.25 kg,
Accelaration = 44.7842 RPM/s
Time = 1.733 s

_ Trial 2
Power Level = 75
Mass = 0.3 kg
Accelaration = 74.8761 RPM/s

_ Trial 3
Power Level = 75
Mass = 0.1 kg
Accelaration = 35.497 RPM/s
Here is the graph we’ve got:

After that, we kept the mass constant and change the power level, to figure out the relationship between powerl and accelaration.
_ Trial 1
Power Level = 75
Mass = 0.25 kg
Accelaration = 15.2477 RPM/s

_ Trial 2
Power Level = 100
Mass = 0.25 kg
Accelaration = 88.1067 RPM/s

Here is the graph we’ve got:

Next we measured the height of string to which the mass is attached ( we got
h = 0.24m ), in order to calculate the potentiel energy which is eaqual to m*g*h ( product of mass, gravitationnal constant, and the height).
We just plugged the formula in our excel file, and it gave us the results directly.

To calculate the power ( mgh/ time ), we used the same method, just plugged the formula in the excel file.

CONCLUSION:

_ When the mass increases, the accelaration decreases, ( a = F/m, Newtown’s second law ).
_ When the accelaration increases, the power level also increases.
_When the battery drainage increases, the mass increases too.
_ When the power level increases, the power also increases.