Lab_Manual_03

# Lab_Manual_03 - Lab 3 Velocity and Acceleration Objects...

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Lab 3 Velocity and Acceleration Objects moving with uniform velocity are not common in real life, although we come across many examples of nearly uniform motion. Speeding and slowing down objects are very common around us. When an object changes its velocity, it is said to be accelerating. Acceleration is the rate of change of velocity. 21 change of velocity v Acceleration = = change of time t v v v a = = t t This equation can also be written as v 2 = v 1 + at where velocity changed from v 1 to v 2 in a time t Question: What is the unit of acceleration? ……………………………………………………………………………… Activity: θ o Trolley Timer Tape Attach one end of a tape to a trolley and pass it through the ticker timer. A string attached to the trolley passes over a pulley and a mass is suspended from it which applies a pulling force on the trolley. Turn the timer on with the tape in place. Allow the trolley to move pulling the tape with it. The dots on it should look somewhat like the diagram below.

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2 ________________________________________________________ …. . . . . . . . . . . . . . . . . . . _____________________________________________________________ Cut off the beginning part of the tape where the dots are too close to each other and then cut 6 strips containing 10 dot intervals each. Mark them 1, 2, 3, ….,6 in order. To measure the lengths of these strips, first obtain the conversion factor. Actual length Conversion factor Measured length = Actual length measured by the instructor = ………. . m The length of the strip measured on the computer screen = …………….m Conversion factor = ……… Now use the conversion factor to obtain the actual lengths of each strip. Strip Length (m) 1 2 3 4 5 6 Question: What does the length of each strip represent? ……………………………………………………………………………… ……………………………………………………………………………… Question: Knowing that: change in displacement Average velocity = change in time x t = , what is the average velocity during the first 0.25 s? ……………………………………………………………………………… Question: What is the average velocity during the second 0.25 s?
3 ……………………………………………………………………………… Average velocity during the first 0.25 s can be considered to be the same as the instantaneous velocity at the middle of the first strip. Similarly, the average velocity during the second 0.25 s can be considered to be the instantaneous velocity at the middle of the second strip. Question: What is the change in time from the middle of strip 1 to the middle of strip 2? ………………………………………………………………………………. . The average velocity during the third 0.25 s is the length of the third strip divided by 0.25 and this can be considered to be the instantaneous velocity at the center of strip 3. Fill in the following table for the instantaneous velocities in intervals of 0.25 s.

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## This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.

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Lab_Manual_03 - Lab 3 Velocity and Acceleration Objects...

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