Tuesday, August 3, 2010

LAB 3 FOR THURSDAY AUGUST 5

PhysicsLab3 Thursday, August 5, 2010 Name __________________
Dr Dave Menke, Instructor
I. Title: Linear Motion

II. Purpose: To observe objects moving at a constant speed. Graph the relationships; interpret the graphs

III. Equipment
A rolling object (on wheels or a ball)
Brick or block
Graph paper, pencil, ruler
Masking Tape
Metric ruler
Timing Chronometer (Stop Watch or similar)

IV. Procedure
1. Find a clear, flat surface a few meters long.
2. Using masking tape, mark a starting point, known as “The Starting Point.”
3. Place rolling object on starting point.
4. Have the lab partner practice pushing the object with a consistent force to get the same initial speed each time.
5. After practicing to get a consistent speed, push the object, and timing device simultaneously (same person).
6. At the 2.0-second point, shout “2-second point!” while the second lab partner notes the displacement of the object and marks it with tape. Do this 4 more times. The ball should pass the same point every time, or very close to it. Mark this point, or its average, and label it the 0.00-meter point. (This 0.0 meter point is NOT “The Starting Point.”)
7. Now you are ready. Give the stopwatch to the second lab partner. The first lab partner will then place the object at the starting point, and push it to go. When it crosses the 0.00-meter point, the second lab partner will start the timing device. After 10 seconds, the 2nd lab partner will shout “10-second point!” while a third lab partner notes the displacement of the object and marks it with tape. Have a lab partner note the distance traveled from 0.00-meters. Repeat this 8 more times: one for 9 sec, 8, 7, 6, 5, 4, 3, and 2 seconds. Record the distances v. times in a table. Measure the exact lengths with the meter stick - from the 0.00 point.
9. After putting all the data in the table, graph the nine points.

V. Data & Calculations
1. Distance that the ball travels in 2.0 seconds (on average): ______________
2. The distance traveled for each second, from 10 seconds all the way to 2 seconds:
Make a table and attach

Time (seconds) Distance (m)
10 24
9 23









v1 = (x2 – x1) / (1.0 s)
v2 = (x3 – x2) / (1.0 s)
etc.
vave = Svi / n
3.Make graph of distance traveled, in meters, vs. time (in seconds).
Make graph and attach.

VI. Results
The purpose of this lab was to observe objects moving at a constant speed. Explain how well this was achieved…..

VII. Error Analysis
A. Personal
B. Systematic
C. Random

VIII. Questions
1. Did the ball speed up, slow down, or stay the same speed as it traveled?
Explain or support.
2. What is the shape of the graph you made?
3. How far did the ball travel during each 1.0-second interval?
4. Predict the position of the ball after 12.0 seconds, if you had actually done it. Support
your prediction.

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