A brake is a device used to stop or slow down an object when it is in motion. Here frictional resistance is applied to object and kinetic energy of the object being absorbed. A dynamometer is a device to measure applied frictional resistance. There are two types of dynamometers- absorption dynamometer and transmission dynamometer. Prony brake dynamometer and rope brake dynamometer are the examples for absorption dynamometers. Belt transmission dynamometer and torsion dynamometer are the examples of transmission dynamometers. A prony brake dynamometer has two wooden blocks clamped together on a revolving pulley carrying a lever. A rope is enfolded over the rim of a pulley which is keyed to the shaft of the engine in a rope brake dynamometer. In a belt transmission dynamometer, a belt transmits power from one pulley to another and this results in a difference in tensions between the tight and slack sides. A torsion dynamometer, also known as Bevis-Gibson dynamometer consists of a lamp, two discs and a movable torque finder.
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