# Ap Physics Lab Report- Pendulum

INTRODUCTION: A simple pendulum consists of a mass m swinging back and forth along a circular arc at the end of a string of negligible mass. A pendulum is a weight suspended from a pivot so that it can swing freely. Gravity is the pull that two bodies of mass exert on one another. There are several simple experiments that will allow you to calculate the acceleration due to gravity of a falling object. A simple pendulum can determine this acceleration. The only variables in this experiment are the length of the pendulum (L) and the period of one full swing of the pendulum (T). In this case the independent variable represents the length of the string and the dependent variable represents the period of one oscillation. The control variable is the mass of the pendulum. In this lab our goal was to see if we can prove if the acceleration due to gravity is 9.8m/s2. The R2 in this lab is closed to 9.8 m/s2 . The formula that we used in this lab is T=2πLg and then we solved for g=L(T2π)2. HYPOTHESIS: The gravity will be 9.81 m/s2 at sea level due to the acceleration. PROCEDURE:

Materials: stopwatch, meter stick, support stand, string, mass (200g), rod clamp, protractor. Safety: Be careful not to drop any of the heavy materials or to hit somebody near you by using them. 1. Set up the support stand on a flat surface.

2. Tie to mass at the end of the string in a way that the string would be straight( in this case the mass will be 200g) 3. Measure the distance from the top of the support to the mass attached to the string. ( we used 10 different distances) 4. Pull back the mass keeping the string taut.

5. Measure the angle and keep it relative to vertical ( we kept the angle constant at 20°). We picked a smaller angle so when we would calculate the period we would only get one oscillation per 6. Release the pendulum mass and simultaneously start the stopwatch. 7. Let the pendulum swing through one cycle.

8. Record...

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