# acceleration due to gravity lab report

**Topics:**Error, Scientific method, Time, General relativity, Gravitation, The Times /

**Pages:**5 (978 words) /

**Published:**Sep 17th, 2014

To calculate the acceleration of gravity using the Smart Timers

Steven Ge

AP Physics B1, Per. 7, JSerra Catholic High School

Advisor: Mr. Darling, Dana.

Sep 11, 2014

Abstract The purpose of this lab is to calculate the acceleration of gravity using the Smart Timers. Drops of ball of equal size and start drops at one hundred centimeter height, the amount of time was counted used the Smart Timers. Repeat the same procedure ten times; the amount of times was counted used the Smart Timers. After compared these data were compared, result is the data has about 0.01-second error. The most likely reason is the height is not constant, the each ball drops from approximately one hundred-centimeter height.

Theory The height of a free falling object can be calculated using the following formula: Y = Y0 + V0t – 1/2 * gt2, Note: Y – Y0 =the height. Using this formula, it will be up to solve for “g” and show that formula: g = 2(Y – Y0)/ t2. Follow the formula Y – Y0 =the height, so the Y – Y0 = 100cm. Then using the times data that got from the tests. The result of calculates, it got the several different “g”, take an average. Throw out an extremely large or small value. Hypothesis This lab was designed to calculate the acceleration of gravity using the Smart Timers. The theory predicts that g = 980cm/s2. In the class, the “g” most time is considered to be 9.8m/s2.

Materials

Yellow plastic ball

The Smart Timers

Iron Bracket

Clamp

Target pad

Photogate

The yellow plastic ball is as subjects. Iron Bracket use to constant the height, and clamp use to stable the Smart Timers attached on the Iron Bracket. The Smart Timers is use to count the amount of time. Target pad is part of the Smart Timers, it use to when ball fall on it, it will back to Smart Timers to make it stop timing. Photogate also the part of the Smart Timers, it use to back to Smart Timers the ball start