how machines do work

Efficiency of Machines

Mechanical Advantage

What is a machine

input and output forces

input and output work

input force is the force you put in

a device that allows you to do work in a way that is easier and/or more effective

output force is the force the machine exerts

the input work is the work you do to make the machine do work

the output work is the work the machine does

Changing force

changing force occurs when the necessary amount of force is changed due to the simple machine used, such as using a pulley.

Changing Distance

If the input force is greater than the output force, then the distance might change a result

Changing Direction

some machines will change the direction of the force, instead of the amount of force or the distance

mechanical advantage is how many times easier it is to do something with said machine present

Increasing Force

you increase force with simple machine because, and that is how you calculate mechanical advantage

Increasing Distance

when you increase distance with a simple machine, your M.A. may be less than 1, ex. .5

Changing Direction

with a machine that changes direction, the M.A. will always be one.

in real situations, you lose efficiency with machines

Friction and Efficiency

when overcoming friction, work is always wasted in different amounts

Calculating Efficiency

Efficiency = Output work / Input work x 100%

Real and Ideal machines

because of friction, a machine never has 100% efficiency, but that would be a ideal machine