Gravity lab using mass and force meters

Experimental Procedure:

1. We got our force meter, 10 100g masses and a stand to put our force meter on.
2. I hooked the force meter on to the stand and hanged the 100g mass, while my partner measured the value on the force meter.
3. We repeated the process by adding another 100g mass each turn.
4. We finished the process and formed a data table.
5. Then we added an average point to our data table.
6. Later, we graphed our data’s and drew our min, max and best lines.
7. We calculated our slopes.

Independent Variable:   

• Mass

 Dependent Variable:

• Weight

Controlled Variables:

• Place
• Temperature

DATA COLLECTION AND PROCESSING

RAW DATA

*In the mass row, we have 1% uncertainties because the producer company who has built those masses, says that there may be a 1% percent difference in the masses of those objects.

*In the weight row, we have 0.1 N uncertainties because our force meters were only divided into segments of 0.2 N’s.

CONCLUSION AND EVALUATION

g = 9.9 Nkg-1 ± 0.4

Absolute Error =      I accepted – measured I   =       I 9.821 – 9.9 I  =  0.8%

                                   accepted                                9.821

The range of our experimental value includes the accepted value, so it is accurate, but not precise. The 0.8 % difference between our measured and accepted value might be caused from the misuse of the masses or the loosening of the spring in the force meter.

The source of our real value is from the “ Physics IB Year 11, g Using Masses and Force Meters” lab sheet. It is known that TUBITAK has measured it.