Lab Circular motion - Amanda Lee Xianju Hu Annie Zhang...

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Amanda Lee Xianju Hu Annie Zhang Doreen Valmyr Lab Circular motion Objective : Demonstrate the relationships between centripetal force and velocity and between radius and velocity in uniform circular motion. Materials : String, stopper, tube, 50 g, 100 g, and 200 g hooked masses, paperclip, meterstick, stopwatch. Procedure: Part 1 – Constant Radius. 1. Attach the 50 g mass to the free end of the string. 2. Measure 20 cm along the string from the stopper to the top of the tube. Place a paperclip on the string about 1 cm below the tube. 3. Twirl the stopper in a horizontal circle fast enough to keep the paper clip near but not touching the bottom of the tube (the mass should be hanging freely). 4. Measure the time for 10 revolutions. Calculate and record the period (the time for one revolution) in the table below. 5. Repeat steps 3 and 4 with 100 g, 150 g, 200 g, and 250 g hanging from the string. Part 2 – Constant Force. 6. Repeat steps 1 through 4 above using the 50 g mass and 20 cm radius. 7. Repeat steps 2, 3, and 4 changing radius to 30 cm, 40 cm, 50 cm, and 60 cm. 8. Calculate and record the data in the table. Radius, r (m) Mass, m (kg) Period, T (s) Frequency, f (s -1 ) Centripetal force, F c (N) Velocity, v (m/s) 0.20 0.05 0.66 1.52 0.49 1.91 0.20 0.10 0.45 2.22 0.98 2.79 0.20 0.15 0.32 3.13 1.47 3.93 0.20 0.20 0.26 3.85 1.96 4.84 0.20 0.25 0.26 3.85 2.45 4.84 0.20 0.05 0.66 1.52 0.49 1.91 0.30 0.05 0.63 1.59 0.49 3.00 0.40 0.05 0.59 1.69 0.49 4.25 0.50 0.05 0.56 1.79 0.49 5.62 0.60 0.05 0.56 1.79 0.49 6.75
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