Physics lab 4

# Physics lab 4 - Jon Crowley Andy Physics Lab Sec 1 Air...

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Jon Crowley Andy Physics Lab Sec. 1 Air Slide Lab Data Collection The overall purpose of this lab was to observe linear motion and the effect that differentiating heights has on velocity and acceleration. To do this we used an air slide track approximately 1.5 meters (m) long. A sled sat on top of the track. The sled is a frictionless device that uses the air out of the slide, as well as gravity, to move in a linear direction. The slide and sled system had an attached motion sensor which fed data to a computer. This data would give us information like; position (m), velocity (m/s), and acceleration (cm/s 2 ). Initially we measured the change in height of the slide. To do this, you would simply pick two points along the slide; ours were at the front and near the end, and measure the height. By subtracting the larger height from the smaller you get the change in height (Δ h ). We also measured the distance on the slide that the sled would travel, also called the length ( L ) of the slide. A diagram labeled with the components of the initial setup is shown below. Δ h = 8.4cm L = 149.5 Ideally, the sled would slide down the track with a constant acceleration due to the frictionless track and the force of gravity. Gravitational acceleration on Earth is 9.8m/s 2 . This is the acceleration of an object in freefall. However, our sled is not in freefall, it is sliding down a track. The reduced acceleration of the sled is due to the angle of the track. The equation for this reduced acceleration is a = g sin θ where g is gravitational acceleration and θ is the degree of incline in the slide. This final value will be computed later in this report. With the sled at the top of the track, we first measured its position. With the air on, we start the sensors and let the sled go. The computer is recording data with a time spacing of 0.1 seconds and collecting about 30 points per iteration. After the sled has made a run down the slide, the computer gives us 4 columns of data. These columns

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represent position, velocity, and acceleration all corresponding to time. The data for our first run is shown below in the chart. Data Analysis Chart 1 Data corresponds to Blue lines Time (s) Pos. (m) v (m/s) a (cm/s2) 0.2 1.26 -0.01 -18.1 0.4 1.26 -0.036 -25.8 0.6 1.256 -0.092 -33 0.8 1.232 -0.184 -48 1 1.184 -0.296 -53.6 1.2 1.112 -0.408 -46.6 1.4 1.02 -0.514 -2.1 1.6 0.907 -0.618 189 1.8 0.772 -0.185 540.2 The only differences between runs 1 and 2 are the change in height (Δ
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Physics lab 4 - Jon Crowley Andy Physics Lab Sec 1 Air...

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