Lap Report #4.docx

# First we reduced the radius to 17 cm and the next

• Lab Report
• 11

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pointer. First, we reduced the radius to 17 cm and the next time we increased it to 21 cm. At each radius we calculated a static force since a different amount of mass was needed

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83 Rotations/60 seconds = 1 rotation/x seconds 83*x = 60 X = 60 /83 = 0.72  So, in 0.72 seconds the bob made one rotation.  The radius also had to be converted to meters: 19cm * (1 meter/100cm) = 19/100 = 0.19 m  Plugging in the radius and T into the equation V = (2*pi*r) / T: (2*pi*0.19) / 0.72 = 1.66 m/s We weighed the bob on the scale to find its mass. The bob weighed 445.1 g. Converting to kg: 445.1/1000 = 0.4451 kg Now velocity, radius, and mass of bob are known: V = 1.66 m/s Mass of bob = 0.4451 kg Radius = 0.19 m Inserting these numbers into the formula F c  = (mv^2)/ r: (0.4451*1.66^2) / 0.19 = 6.5 N In the next calculations of centripetal force, we changed the mass of the bob twice while keeping  the radius at 19 cm (0.19 m). Then we adjusted the radius twice while keeping the mass of the  bob at 445.1 g.

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Adjusting for mass of bob: 1) We added 50 g to the bob. The total mass then is 445.1 g + 50 g = 495.1 g Converting to kg: 495.1/1000 = 0.4951 kg
• Spring '14
• Hedberg

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