What is machine? What is gear?describe various types of gear and it's use. Thermodynamics related questions. Newton's law ... 5s, in brief.

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A machine is a device that uses energy to perform a specific task. A gear is a rotating machine part with teeth that mesh with other gears.

A machine is a mechanical or electrical device that uses energy to perform work or tasks.
Gears are mechanical devices with teeth that mesh with other gears to transmit motion and power.
Types of gears include spur gears, helical gears, bevel gears, worm gears, etc.
Spur gears are the most common type and have straight teeth that are parallel to the gear axis.
Helical gears have angled teeth that gradually engage, resulting in smoother and quieter operation.
Bevel gears have teeth that are conically shaped and are used to transmit motion between intersecting shafts.
Worm gears consist of a worm (screw) and a worm wheel and are used to transmit motion at a right angle.
Gears are used in various applications such as automobiles, machinery, clocks, and robotics.

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