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