Answer :

Electric bench or pedestal grinders are powered by motors that provide rotational kinetic energy to grindstones, which are used for shaping, sharpening, and smoothing materials, mostly metals.

The question involves electrically powered stationary grinding machines, which are commonly referred to as bench grinders or pedestal grinders. These machines are used in various industrial and engineering contexts to shape, sharpen, or smooth different materials, typically metals.

The motor of such a grinder spins a grindstone, imparting rotational kinetic energy to it. When a workpiece contacts the grindstone, its surface is modified through the abrasive action, producing heat, light, sound, and vibration as by-products of the grinding process. The energy that powers the motor is transformed into these various forms, with a significant amount being utilized as rotational kinetic energy during the grinding operation.

So, electric bench or pedestal grinders are essential tools in material fabrication and metalworking, employing rotational motion and the principles of work and energy to modify workpieces. Their operation can be understood within the framework of rotational energy and friction inherent to engineering and physics disciplines.

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Rewritten by : Barada