Work output can never be greater than work input. Machines allow force to be applied over a greater distance , which means that less force will be needed for the same amount of work. When a machine changes the size of the force, the distance through which the force is exerted must also change.
Why can’t the output work be greater than the input work?
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.
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.
Can the output force be greater than the input force?
Increasing Force : When the output force is greater than the input force, the mechanical advantage of a machine is greater than 1. Increasing Distance: When a machine increases distance, the output force is less than the input force.
Can work input and work output be equal?
Solution: Work input is work done on a machine to get the desired output. ... For an ideal machine, the work output is equal to the work input i.e the efficiency is 1 .
Why is the work done by a machine always less than the work done on a machine?
Because of friction , the work done by a machine is always less than the work done on the machine. Because friction is always present, the actual mechanical advantage of a machine is always less than the ideal mechanical advantage. of a machine is the number of times that the machine increases an input force.
Why is the work output of any real machine less than the work needed to operate it?
Why is the work output of any real machine less than the work needed to operate it? Work is lost because of friction . Some of the work input is always used to overcome friction in a machine. ... and the work input (required) is greater than the work output.
What happens if the input distance of a machine is greater than the output distance?
If the input distance of a machine is greater then the output distance then the IMA for that machine is greater then one . ... To calculate the efficiency of a machine divide the work output by work input and then multiply by 100.
When work is done work output?
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.
What shows the relationship between work input and work output?
no, work output is always less than work input. 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.
What happens to the mechanical advantage of a machine if the output force is greater than the input force?
A machine’s mechanical advantage is the output force multiplied by the input force. If the output force is greater than the input force, the mechanical advantage of the machine is greater than one. ... The ideal mechanical advantage of an inclined plane is the length of the plane divided by its force.
What is an example of a machine for which the output force is less than the input force?
A ramp is an example of a simple machine called an inclined plane. An inclined plane is a flat, sloped surface. An inclined plane allows you to exert your input force over a longer distance, as shown below, so the input force needed is less than the output force.
In which simple machine is output work greater than input work?
(a) In the case of the wheelbarrow , the output force or load is between the pivot and the input force. The pivot is the wheel’s axle. Here, the output force is greater than the input force. Thus, a wheelbarrow enables you to lift much heavier loads than you could with your body alone.
How did the work output relate to the work input for the pulleys?
In a pulley system without friction, work input equals work output: Work (in) = Work (out). ... It will be necessary to determine force when you want to calculate the work input in a pulley or a system of pulleys. Work is determined by multiplying force by distance traveled: Work (W) = Force (F)X Distance (d) W=Fd.
What is the difference between input force and work input?
Input force is the force that you exert on an object. Output force is the force the machine exerts on an object. ... Input work is the input force times (x) the input distance . Output work is the output force times (x) the output distance.
What is the difference between an input and output force?
What is the difference between the input force and output force? Input- force you exert on a machine, output- force exerted by a machine . ... Output- the distance the output force is exerted through.
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.
Why is the output of a machine less than the 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. All machines make work easier, but they don’t increase the amount of work that is done.
Why is the efficiency of a machine always less than 100 percent Why?
The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction , the efficiency of any machine is always less than 100 percent.
Why can’t the actual mechanical advantage of a machine be greater than the ideal mechanical advantage?
The actual mechanical advantage of a machine reflects the increase or decrease in force achieved by the machine. ... It is always greater than the actual mechanical advantage because all machines must overcome friction .
What makes output energy less than input energy?
The reason the output work is always less than the input work in real machines is that all machines experience energy loss in some form during the energy conversion process or in the mechanics of the machine. ... Sound energy or hissing is also another way that energy is wasted from a system.
Is AMA less than IMA?
In the real world, the AMA will always be less than IMA due to friction . The AMA is the actual amount the force is lessened by and the TMA is the amount the force would be lessned by without friction. Friction means that the Efficiency of any machine will be less than 100% in the real world.
What does it mean when the mechanical advantage is greater than 1?
A machine with a mechanical advantage of greater than 1 multiplies the input force .
What factor must be increased to give a machine a mechanical advantage greater than one?
Load must be increase to give a machine MA greater than 1.
In which of the levers is the input force greater than the output force?
When the input force is applied farther from the fulcrum than the output force is, the output force is greater than the input force, and the ideal mechanical advantage is greater than 1. This always occurs with second-class levers and may occur with first-class levers.
What is the ratio of output work to input work represent?
Mechanical advantage is a measure of the ratio of output force to input force in a system, used to analyze the forces in simple machines like levers and pulleys.
How can you increase the work output of a machine?
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!
What is the relationship between the input energy and output work in an ideal machine?
Machines. A machine is an object or mechanical device that receives an input amount of work and transfers the energy to an output amount of work. For an ideal machine, the input work and output work are always the same .
What’s the relationship between the input energy and the output work in an actual machine?
For a machine to function, work or energy needs to be put into the machine; this is called work input. Work output is the energy that comes out of the machine. The output work done by a simple machine can never exceed the input work done on the machine.
What does the ratio of output to input work represent?
Efficiency can be expressed as a ratio by using the following formula: Output ÷ Input. Output, or work output, is the total amount of useful work completed without accounting for any waste and spoilage. You can also express efficiency as a percentage by multiplying the ratio by 100.
What determine the work output of a system?
The formula to calculate work efficiency is the ratio of output to input expressed as a percentage. For a machine, you can determine the work put into the machine depending on how the machine works. You can generally calculate work by multiplying the force times distance for the motion .
What prevents the output work from never being greater than the input work in an ideal machine *?
A comparison of a machine’s work output with the work input. The work output of a machine can never be greater than the work input. In fact, the work output of a machine is always less than the work input due to friction .
What is the difference between work and machine?
A machine is any device that makes work easier by changing a force . Work is done whenever a force moves an object over a distance. There are six types of simple machines that are the basis of all other machines. These are the inclined plane, lever, wedge, screw, pulley, and wheel and axle.
Which machine makes work easier by increasing the output force?
A wedge is a simple machine that consists of two inclined planes, giving it a thin end and thick end. ... A wedge makes work easier by increasing the force applied to the object, although it applies the force over a shorter distance. This gives the wedge a mechanical advantage greater than 1.
What is the mechanical advantage if your input force was 10n and your output force was 20n?
What is the mechanical advantage of a machine with an output force of 20 N and an input force of 10 N? The mechanical advantage is 20 N ÷10 N , or 2.
How does lubricating a machine affect the output work from that machine?
Lubrication a machine increases the output force because it decreases friction . ... The mechanical advantage of a machine is less than one. Compare the distances over which the input and output forces are applied.
Is it true that work is done on an object when the object moves in the same direction in which the force is applied?
For work to be done, the force must be applied in the same direction that the object moves. Work is directly related to both the force applied to an object and the distance the object moves. It can be represented by the equation: Work = Force × Distance .
Can output force be greater than input force?
Since machines do not reduce the work you do, your output work can never be greater than your input work . In some machines, the output force is greater than the input force. If a machine allows you to use less input force to do the same amount of work, you must apply the smaller input force over a greater distance.
Can you make the work output of a machine greater than the 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.
What is work output and input?
• Work In, Work Out: The work that you do on a machine is called work input . The work done by the machine on an object is called work output.
What is work output divided by work input?
efficiency . equals the output work divided by the input work; expressed as a percentage. inclined plane. simple machine that is a flat surface, sloped surface, or ramp.
How much work does a pulley do?
A pulley system makes it easier to lift an object than lifting the dead weight by hand . A single pulley essentially changes the direction of the pull or force applied. When a person uses two or more pulleys in a system, then the system also multiplies the force applied besides changing its direction.
What is the input work?
Input work is the work done on a machine as the input force acts through the input distance . Other ways it would be the work done on a body or system, that is, forces that are applied to the body or system. This is in contrast to output work which is a force that is applied by the body or system to something else.
