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CENCO Quantitative Centripetal Force Apparatus |
Tested in thousands of student lab experiments, our well known Quantitative Centripetal Force Apparatus has proved its worth.
Its simple concept and robust construction guarantee reliable lab success. A hanging mass and a counter-balance are attached to a horizontal bar mounted atop a vertical shaft about 45cm high, and the suspended mass is tied to the vertical shaft with a horizontal spring. When the shaft is spun, the suspended mass swings away.
The displacement at any given speed is marked by a vertical mounted pointer that can be moved laterally to match the pointed tip of the suspended mass. From the mass, the speed of rotation and the radius, one can quickly calculate the centripetal force. Using the included weight hanger and ball-bearing pulley, you can measure the force required under static conditions to displace the mass the same distance against the pull of the spring. Spring and mass are dimensioned to ensure a rotational speed slow enough to be safe and easily counted.
The vertical shaft rests in a ball-bearing mount that minimizes wobble and friction. The entire device is mounted on a 15 x 41cm base with three adjustable feet. The moment of Inertia Accessory, a 34cm threaded rod to which slotted weights can be clamped with the included wing nuts is also included. After mounting the rod at the top of the shaft and adding weights, the weight hanger with its weights is allowed to fall, accelerating the system. From the change in position of the weight hanger with time the moment of inertia of the system can be determined. Complete with weight hanger, hook, cord and complete instructions. You will also need a slotted weight set.
View the Quantitative Centripetal Force Demonstration - watch the video!
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- Tuesday, October 05, 2010 Simple and elegant experiment Reviewed By: Paul (Valparaiso, IN) An excellent apparatus which clearly demonstrates the forces required for circular motion. The mass hangs free eliminating possible friction effects from pulleys. The stretching of the spring gives the beginning student a clear indication that a force is being applied.
The bearings are very low friction and will continue to spin for a long time. It works great without the motor.
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