AS3/ Expt-g/ Dana

DETERMINING THE ACCELERATION OF FREE FALL (g) USING THE LIGHT SENSOR By Dana Lin AS3 October 2009

DEFINITION OF KEY TERMS ,[object Object],[object Object],[object Object],Dana Lin, AS3 October 2009

MEASURING g 1. The equipments required: ,[object Object],[object Object],[object Object],[object Object],Dana Lin, AS3 October 2009

M EASURING g (cont’d) 2. The set-up of apparatus Dana Lin, AS3 October 2009

M EASURING g (cont’d) 3. Procedures ,[object Object],[object Object],[object Object],[object Object],[object Object],Dana Lin, AS3 October 2009

E XPLANATIONS ,[object Object],[object Object],Dana Lin, AS3 October 2009

ACCURACY & PRECISION ,[object Object],[object Object],Dana Lin, AS3 October 2009

RELIABILITY & SOURCES OF ERROR ,[object Object],Dana Lin, AS3 October 2009 Systematic errors arise from the equipments used. As long as we ensure that the timer starts at 0 and there is no reaction time between the light sensor and the digital stopwatch, the systematic errors are eliminated. One thing to keep in mind is the calibration of the measuring tape. Just like any ruler, it can be subject to calibration errors.

RELIABILITY & SOURCES OF ERROR (cont’d ) ,[object Object],[object Object],For most falling objects in air, the air resistance will affect is acceleration. Air resistance is considered a random error because wind-speed varies so it is not constant. But because the ball used in this experiment is heavy and will only fall for a short distance, air resistance has little effect on it. Therefore, the ball’s acceleration is effectively g . Dana Lin, AS3 October 2009 2. Uncertainties in the rule r Assuming that the smallest division on the measuring tape is 0.1cm, then the uncertainty would be + 0.1 cm ( + 0.05cm x 2). This should be taken into account when we calculate g using the equation given earlier on.

BIBLIOGRAPHY & REFERENCES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dana Lin, AS3 October 2009

AS3/ Expt-g/ Dana

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