Mechanics Circular Motion Intro Experiment:


Purpose:

  • The purpose of this experiment is to introduce circular motion, by finding the mass of a bob and then verifying its mass using scales.


Equipment:

  • Stopwatch
  • 1 meter ruler
  • slotted masses
  • tube
  • rubber bob

Method:

spinning_bob.GIF
  • Connect a 50g mass to the bottom of the string. Use tape to mark on the string, so you know when it is 1meter long etc.
  • Spin the bob, so as to maintain the radius of the string for the applied mass (which is equal to centripetal force).
Complete the following table:
Trial number
Radius
Mass (slotted)
Fw = Fc
Time
Velocity
Mass

[m]
[kg]
[N]
[s]
[m/s]
[kg]
1






2






3






4






5






To find the speed of the spinning bob we use v = d / t
where d is the circumference of the circle the bob makes when you swing it and t
is the time it takes to complete one period.
so v = 2 ᴨ r / t

Use Fc = m v2 / r to determine the mass of the bob.





Pitfalls / causes of error

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Resources

Model Data:
  • DSC00758.JPG


Model data:

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References / other comments:

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