Dasha's Mechanical Efficiency Home Page

Here are links to my other pages
~ Work Input-Work Output~ Friction~ Calculating ~ Practice-Quiz~ Practice-Quiz Answer~ Bibliography~

Mechanical Efficiency- the efficiency (in percent) of a machine that is used to preform a task (ex.the efficiency of a ramp used to push up a box or the efficiency of a lever used to lift a weight).
Work Input- the work put into preforming a task
Work Output- is the work that the machine is designed to preform
Friction- the force that opposes the motion of an object.

external image Good_&_Bad_Office_Lifting.gif
Here is an intro video to mechanical efficiency

You want a machine to be as efficient as possible so that it doesn't take up a lot of energy and so that it will be easier to complete a job. -------------->

external image mechanical_engineers_do_it_with_efficiency_mousepad-r8c18db81b74f41a0b050e52c0da87315_x74vi_8byvr_216.jpg
MECHANICAL EFFICIENCY: You get the percentage of mechanical efficiency by taking the Work Output and dividing it by the Work Input and multiplying the answer by 100.

Here is a short intro video on Mechanical Efficiency (ME).........

Notes about mechanical efficiency-
Mechanical efficiency can never be 100% because the force of friction transfers the work energy into heat energy, therefore requiring more input work to compensate for the work loss because of friction.

A way to improve efficiency of any machine is to and oil or something greasy to the parts that touch each other so that the surfaces run faster, therefore creating less friction and putting the input work to use.

Another way to improve efficiency is to flatten and straiten any jagged of rough surfaces so that the friction is reduced and the input work is put to use.