(This should be in paragraph form and should explain the objective and the related theory. For example, what is the overall objective of the experiment, and what are you going to measure to accomplish it? The Introduction should not exceed one page.)
The objective of the experiment is to understand the meaning of displacement, average velocity, instantaneous velocity, average acceleration and instantaneous in one-dimensional motion. The first experiment was to calculate the average and instantaneous velocity. We first positioned the air track as described in the experiment manual. Then we put the photogate G1 on the 40cm mark, the photogate G3 on the 170cm mark, the photegate G2 on the 110cm mark and let them parallel to the air track. We called them xG1, xG2, and xG3. Next, we calculated the delta x is 130cm. Then we began to record the position of the right edge of the glider on the air track when it was blocked and unblocked, xb and xub. These two parameters meant the uncertainty in the experiments is as same as that for the xG1 and xG2. The xb is 45.53cm and xub is 48cm. We inputted these data to the computer. Then we put the glider to make it contact with the electro-magnet, and opened the software-controlled switch to do the measurement. The second experiment was to calculate the average acceleration. We first put the photogate G2 away. We let the flag parallel to the air track. We twisted the string of the hanging mass with the glider. We adjusted the position of G1 and G3. The delta x between G1 and G3 is 60cm. Next, we recorded the initial position, xinitial in the measurement window. We turned on the software-controlled switch to do the
