what is the definition of mechanical advantage?

Answer 1

In physics and engineering, mechanical advantage (MA) is the factor by which a mechanism multiplies the force put into it. Following are simple machines where the mechanical advantage is calculated.

The beam shown is in static equilibrium around the fulcrum. This is due to the momentum created by vector force "A" counterclockwise (momentum A*a) being in equlibrium with momentum created by vector force "B" clockwise (momentum B*b). The relatively low vector force "B" is translated in a relatively high vector force "A". The force is thus increased in the ratio of the forces A : B, which is equal to the ratio of the distances to the fulcrum b : a. This ratio is called the mechanical advantage. This idealised situation does not take into account friction. For more explanation, see also lever.
Wheel and axle: A wheel is essentially a lever with one arm the distance between the axle and the outer point of the wheel, and the other the radius of the axle. Typically this is a fairly large difference, leading to a proportionately large mechanical advantage. This allows even simple wheels with wooden axles running in wooden blocks to still turn freely, because their friction is overwhelmed by the rotational force of the wheel multiplied by the mechanical advantage.
Pulley: Pulleys change the direction of a tension force on a flexible material, e.g. a rope or cable. In addition, pulleys can be "added together" to create mechanical advantage, by having the flexible material looped over several pulleys in turn. More loops and pulleys increases the mechanical advantage.

Answer 2

Mechanical Advantage Definition

Answer 3

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Most of it comes from conservation of energy. For instance, for the inclined plane, to raise the load a given height takes energy mgh no matter how far you move it along. So by W = Fd you have the output force of mgh / h = mg (i.e. the weight force) and an input force of mgh / d where d is the length of the plane, so the mechanical advantage is just d / h. The wedge is basically the same as an inclined plane, so it works exactly the same. The others are similar in general idea. Appeal to conservation of energy and momentum and it pretty much falls out.

Answer 4

mechanical advantage
–noun Mechanics.
the ratio of output force to the input force applied to a mechanism.

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Answer 5

It can mean a number of things, like maybe in a lever system, you have a shorte lever arm giving you the mechanical advantage. There are equations to figure this out. Here is one website that explains some of it. http://en.wikipedia.org/wiki/Mechanical_advantage

Answer 6

In simple terms, the mehanical advantage is how much the machine helps you.

Answer 7

mechanical advantage= load x load arm/force(applied) x force arm

Answer 8

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Answer 9

the ratio of the force exerted by a machine to the force applied to it