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Physics I Lab Manual 2011 97

# Physics I Lab Manual 2011 97 - (m 1 in the Fgure on either...

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Example of a well written lab report The Universal Gravitational Constant Background : Newton’s law of gravitation describes the gravitational force between massive objects. The evo- lution of the universe, the motion of the planets, and even the behavior of everyday object can be explained using Newton’s equation for the gravitational force, which says the gravitational force between two objects is directly proportional to the mass of the objects and inversely proportional to their separation squared. Knowledge of the value of the constant of proportionality, G (called the universal gravitational constant), is fundamental to be- ing able to apply this equation, and was experimentally measured in this lab. Experimental Aparatus A “torsional pendulum” was used as a tool for measuring the force of attraction between two pairs of massive objects. The torsional pendulum consists of barbell like structure with 1kg masses
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Unformatted text preview: (m 1 in the Fgure) on either end of a 30cm rod of negligible mass. The structure is suspended from its center of mass by a thin wire of length 1m, and the angle of the structure in the horizontal plane is measured using capacitive sensors. The angular displacement of the torsional pendu-lum caused by a given torque is calibrated by at-taching a string to each end of the barbell and running it over a pulley on the edge of the table so that a mass hanging off the string can supply a known tension to the string, while the change in angular displacement is recorded. Once the torsional pendulum is calibrated, a pair of large test-masses (m 2 in the Fgure) is placed a distance r from the ends of the barbell so that the gravitational force between each of the Example of a We ! Written Lab Report θ r m 1 m 2 m 2 m 1...
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