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PHY133_Acceleration -...

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Introduction In this experiment we measure the gravitational acceleration g . The gravitational acceleration is approximately the same (constant) anywhere near Earth's surface, and varies only slightly (<1%) as function of geography and geology. Equipment l 1 Computer set, l 1 Photogate, l 1 interface box, l 1 Plastic ruler and Masking tape. Method By dropping a ruler through a photogate (an "electric eye") we determine the rate at which an object will accelerate due to the earth's gravitational force. The clear, plastic ruler will be marked at regular intervals with masking tape that will block the light in the photogate and turn on and off the timer in the computer. The times will be recorded in the computer and displayed on the monitor. If supplied with the distance between successive pieces of masking tape, the computer can perform the calculation of the average velocity of the ruler in these time intervals during its descent. The results can be displayed graphically on the monitor in various ways. Procedure 1. Preparing the ruler: lay a piece of masking tape across the ruler so that it lines up exactly with the 0 cm marker line. Then lay down the next piece tightly against the first one. Repeat the procedure until the tape covers the entire length of the ruler. Starting from the second piece, peel off every other piece of tape so that the ruler looks like a blunt "picket fence." Lay the peeled off tapes directly over the ones on the ruler so that you end up with a double thickness. This makes the tape block the light more efficiently. Trim off any extra tape.
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