EM-12 Kater's Reversible Pendulum
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This one meter compound pendulum provides very accurate measurements of the acceleration due to gravity. It consists of a heavy steel bar carrying a large and a small brass bob, and a pair of knife-edge pivots at each end so that the pendulum can be swung from either end. The bobs can be moved on the bar to adjust the period. The experiment requires several precise measurements of the period. By adjusting the small bob, the period can be made equal when swung from either end. The value of g can be calculated from the period and the separation of the knife edges. Specifications Length Between knife edges 100.00 cm Overall 152.5 cm Mass Large bob 1.5 kg Small bob 0.68 kg Pendulum w/bobs 4.8 kg
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EM-16 Basic Pendulum Set
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This experiment studies simple harmonic motion of swinging and bouncing pendulums. The pendulums mount on a horizontal rod which clamps onto the 13 mm vertical support rod with a meter scale and a cast-iron tripod base. The swinging pendulums have a 25 mm brass bob and an acrylic bob of the same diameter together with a length of flexible cord for suspending them so that the effect of length and bob mass can be measured. The spring pendulum comes with springs of three lengths: 25 mm, 50 mm and 75 mm so that the effect of spring length on the force constant can be examined. A mass holder is hung on the end of the spring to enable the student to measure displacement as a function of mass (Hooke's Law). Specifications Bobs 25 mm dia brass & acrylic balls Weight Holder w/10, 25 & 50 g weights Springs Helical springs 25, 50, and 75 mm Force constants: 3.2, 2.5 &1.8 Newtons/m
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