Although nearly equal, the output work is less than the input work because of friction . All machines use some amount of input work to overcome friction. The only way to increase the work output is to increase the amount of work you put into the machine. You cannot get more work out of a machine than you put into it!
Why can work output never exceed work input?
Potential energy is not work, kinetic energy is work. The work OUTPUT of a simple machine can NEVER EXCEED the work INPUT! (You can never get more work out of a machine than you put into it! When you design a machine that MULTIPLIES force, you pay by having to apply the force over a greater DISTANCE.)
Is work output always lower than energy input?
In physics, work output is the work done by a simple machine, compound machine, or any type of engine model. In common terms, it is the energy output, which for simple machines is always less than the energy input , even though the forces may be drastically different.
Why is W out always less than W in?
In fact, the work output of a machine is always less than the work input. ... Because: Some of the work done by the machine is used to overcome the friction created by the use of the machine . But keep in mind that no work is lost. The work output plus the work done to overcome friction is equal to the work input.
Can you make the work output of a machine greater than work input?
The only way to increase the work output is to increase the work input . You can’t get more work out of a machine than you put into it. The moving parts of a machine must use some of the work input to overcome friction. Because of friction, the work output of a machine is always less than the work input.
Why is output less than input?
The output work is always less than the input work because some input work is used to overcome friction . Therefore, efficiency is always less than 100 percent. ... Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work).
Can the work output of an engine be greater than the source of energy?
Unsourced material may be challenged and removed. Since a machine does not contain a source of energy, nor can it store energy, from conservation of energy the power output of a machine can never be greater than its input , so the efficiency can never be greater than 1.
How do you calculate work input and output?
Work is determined by multiplying force by distance traveled : Work (W) = Force (F)X Distance (d) W=Fd. Write this equation down to use when you want to calculate work input in a pulley or a system of pulleys. Lift the mass by pulling on the cord using the newton spring scale.
What is the useful work output?
efficiency . The efficiency of a machine is the ratio of useful energy output to total energy input, or the percentage of the work input that is converted to work output. Efficiency can be expressed as the ratio of useful work output to total work input.
What is work output and input?
Work input is work done on a machine to get the desired output . Work output is the amount of desired work that is done by a machine.
Why can a machine not be 100% efficient?
A machine cannot be 100 percent efficient because output of a machine is always less than input . A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.
How can you increase the efficiency of a machine?
For a lever, you can increase the machine’s efficiency by reducing the friction .
How Can machines be made more efficient?
Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction . Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient. ... Bicycles lose energy to friction and to air resistance.
When you use a machine the output work can never be greater less than the input work?
Machine Efficiency
Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work). The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent.
Which shows the relationship between work input and work output?
Which shows the relationship between work input and work output? input force x input distance > output force x output distance . ... the distance through which you exert a force increases the amount of force required.
How much a machine changes the input force is its?
Mechanical advantage is how much a machine changes the input force. 2. Mechanical advantage can be calculated as the ratio of the output force to the input force of a machine.
