gears

gears

• Submitted By: tlill
• Date Submitted: 11/16/2014 1:51 PM
• Category: Technology
• Words: 376
• Page: 2

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Gears are simple machine that was basically an improved wheel and axle. A gear is a toothed wheel that engages with another toothed wheel or with a rack in order to change the speed or direction of transmitted motion. Gears are an integral part of many automatic devices. The wheels of gears have teeth also known as grooves, around their outer side that fit into other gears. In a few gears, the larger ones would rotate slower than the smaller one. However, the bigger one moves with a larger amount of force. If the gears are similar sizes, both rotate at the same speed. In a series of related gears, each gear changes the way of the spin of the gear before it. Knowingly there are multiple ways to utilize gears such gears for force, worm gears, rack and pinion gears and gears for speed. For example, when using an electric motor and a long screw-like gear to drive a large gear wheel; this arrangement is called a worm gear. It reduces the speed of the motor to make the large wheel turn with more force, but it's also useful for changing the direction of rotation in gear-driven machinery.

If a gear gives you more force, it turns out you would have less speed at the same time. If it gives you more speed, it has to give you less force. In reality, when bicycling you're going uphill in a low gear, the individual would then have to pedal much faster to go the same distance. When you're going along strait, gears give you more speed but they reduce the force you're producing with the pedals in the same proportion. To sum up, mechanical advantage is a tradeoff between force and distance because it is a ratio between the distances over which the effort force acts to the distance moved by the load.

Mechanisms such as gears, pulleys and sprockets are mechanisms which are used to transfer energy through rotary motion. Some factors causes changes in the speed of rotation, the direction of rotation and the amount...