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# Measuring the gravitational accelearation

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Introduction

Measuring the gravitational acceleration Lab report Planning Apparatus A string (about 0.5m), stop watch, bob (weight), stand with a clamp, ruler (1m), angle meter, protractor. Variable/Constants Constant - Angle of release (20 degree) - Mass of bob - Number of Swings (20 times) Variable - Length of string Method 1. Get a string and stick it with a small bob. ...read more.

Middle

If the time difference between the two trials is big, take one more recording to get more accurate data. 7. Do the experiment until the length reaches until 0.19 meter. Data Collection Length Time (for one swing, in sec) Av.Time (Av.Time)2 (Length of string, in meter) Trial 1 Trial 2 0.49 1.40 1.39 1.40 1.95 0.43 1.32 1.31 1.31 1.72 0.37 1.21 1.21 1.21 1.46 0.31 1.13 1.13 1.13 1.27 0.25 0.99 0.99 0.99 0.98 0.19 0.88 0.88 0.88 0.77 Uncertainties For this particular experiment, there exists an 'uncertainty' factor. ...read more.

Conclusion

and its smallest gradation is 0.005 meter, also the time is recorded by stopwatch which is digital scale (instrument) and its smallest division is 0.01 second. As a result, we can say that the length (in meters) has 0.005 meter uncertainty (which means the data will be rounded up at 0.005 meter. For example, 0.49 meter, might be read as 0.485m or 0.495m) and the time has an 0.01 seconds uncertainty (which means the data will be rounded up at 0.01 second For instance, 1.40s, it could be read as 1.39s or 1.41s) Data Analysis ?? ?? ?? ?? ...read more.

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