Copy_of_Walker_Centripetal_Force_Lab_Handout-v3

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PHYS-350

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Feb 20, 2024

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Name:_______________________________Roster #: ____________ Period: _________ Name:____________________ Note: For each trial, vary the length of the radius. Data Data Table 1 Mass of Pendulum bob (kg) .154 kg Width of pendulum bob (m) 3.0 cm Weight of bob (N) .00151 N

Data Table 2 Trial Radius (m) Δt (s) Maximum F T (N) 1 .69 m 0.8 s 1.8 2 .56 m 0.9 s 1.9 3 .53 m 0.9 s 1.9 4 .44 m 0.9 s 2.0 5 .17 m 0.6 s 2.4 Analysis 1. Calculate the speed of the pendulum bob at the lowest point of the pendulum’s swing for each trail, and record this in Data Table 3. 2. Calculate the centripetal force Fc for each trial from the mass of the pendulum bob m , radius of the bob’s circular path R , and the calculated speed of the pendulum bob v , and enter in Table 3. Data Table 3 Trial Velocity (m/s) Fc calculated (N) 1 1.1 .27 2 1.2 .40 3 1.2 .42 4 1.2 .50 5 .99 .89

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Data Table 4 Trial Fc measured (N) 1 .29 2 .39 3 .39 4 .49 5 .89 3. Draw a free-body diagram showing the forces acting on the moving pendulum bob at the lowest point in the swing. 4. Write an equation for the centripetal force on the bob at the lowest point in the motion in terms of the forces identified in step 3. Use this equation to determine the centripetal force that acted on the bob for each of your five trials and record in Table 4. Fc = Ft - Fg Conclusions 1. How should the calculated and measured values for the two centripetal forces for each trial compare? Looking at your data, did you find this to be true? Bloc k Ft > Fg

The calculated and measured values for the 2 centripetal forces should match. We did find this to be true. 2. What are possible reasons for any discrepancies between the two values? Measurements could be inaccurate or rounded, making them different by a tenth.

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