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Experiment Determination of Mass (AP)

Experiment Determination of Mass (AP) - 8 Use the...

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AP Physics Experiment – Determination of Mass (Inertia Balance) Purpose To determine the mass of an unknown object Procedures 1. Measure & record the mass of a C-clamp. 2. Secure the C-clamp on the inertia balance pan. Set the pan in motion with a small amplitude by pulling the pan slightly to one side. 3. Record the time (sec) required for the pan to complete 30 vibrations. The period of an oscillation is the time required for the pan to complete one cycle. Repeat this step three times. 4. Repeat steps #1-3 adding at least three additional C-clamps to the balance pan. The clamps should not bend the struts of the inertia balance. 5. Plot a graph using MS Excel of the mass (kg) versus the period squared (sec 2 ). Period is calculated by dividing the time by 30 vibrations. 6. Remove the C-clamps from the pan. 7. Place the unknown cylindrical mass in the pan slot and repeat step #3. Secure the mass in the slot by wrapping several rubber bands around the center of the cylinder.

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Unformatted text preview: 8. Use the graph (calibration curve) to determine the magnitude of the unknown mass. Draw a line from the unknown's period on the y-axis to the corresponding mass on the x-axis. Data Mass (kg) Time #1 (sec) Time #2 (sec) Time #3 (sec) Avg Time (sec) T 2 (sec) 2 Unknown Analysis The following questions should be answered as part of the data analysis: What is the relationship between inertial mass and gravitational mass (weight) as scalar and vector quantities? What is the mathematical significance of graphing period SQUARED versus mass in terms of the relationship between these variables? What is the property of inertia in light of Newton's first law of motion? What is the purpose of suspending the cylinder from a ring stand using strings so that the mass does not rest on the inertia balance pan? Is there a difference between the calculations for the cylinder when resting on the pan versus suspended by strings? Explain....
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