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Circular Motion

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Introduction

Circular Motion

Jeff Leeson

Per. 3

6/5/09

Introduction / Purpose

Circular motion is the motion that links velocity, mass, and radius of the string of an object. If any one of the factors is changed, the motion of the object gets affected or the velocity/acceleration gets affected. All objects going through circular motion experience a force called the centripetal force. Centripetal force is the force that acts from the center of the circular path and makes the object move in the curve instead of flying out. In other words, centripetal force is the force that originates from the center and is directed inwards. Also, one important factor in this lab is that the circular motion will be horizontal.

In this experiment, the factor that will be changed is the radius of the string. This will bring in a direct change in the motion of the rubber stopper attached to the string. The string will pass through a plastic

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Middle

0.600

5.94

6.13

5.60

0.59

   0.61

0.56

0.500

5.28

5.44

5.28

0.53

0.54

0.53

0.400

4.97

4.94

4.84

0.50

0.50

0.49

0.300

4.72

4.57

4.60

0.47

0.46

0.46

0.200

3.57

3.53

3.59

0.38

0.35

0.36

0.100

3.25

3.12

3.38

0.33

0.31

0.34

±0.001m

±0.01s

±0.001s

        Average time of one rotation at decreasing radius

Radius

(m)

Time of 10 Rotations (s)

Trial 1

Trail 2

Trail 3

Average Time (s)

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Conclusion

Self-improvements

        The errors/flaws stated above can be prevented by a number of steps. Always during the experiment, the only part the hand should touch is the plastic tube only. Even if the hand touches any other part of the apparatus, the experiment should be stopped carefully and the trial should be re-done. Also, instead of using a marker on the string, he string should be tapped or tagged at the point needed. The tag should be greater than the radius of the hole of the plastic tube so that the tag does not pass through the hole, hence it will not alter the value of the desired radius.

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