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Except for a technical joke about electric heaters (all the losses are heat)

some energy is always lost due to friction (or its equivalent),

The word is entropy.

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The work output is always less than the work input due to energy losses in the form of heat, sound, and friction during the process. These losses decrease the efficiency of the system, making it such that less work is actually delivered compared to the work that was put into the system originally.

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Q: Why the work output is always less than the work input?
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Why is the work output of a machine always less than the work input?

The work output of a machine is always less than the work input due to energy losses in the form of heat, friction, and other inefficiencies. These losses result in some of the input work being converted into forms other than useful output work, leading to a decrease in efficiency.


Is the work output always less than the work input when a machine is used to perform a task?

No, the work output is not always less than the work input when a machine is used. In an ideal scenario, the work output from a machine can be equal to or even greater than the work input, though in practice some energy is always lost due to factors such as friction and heat.


When a machince is used to perform a task work output is always what than work input?

When a machine is used to perform a task, the work output is always less than the work input. This is because some of the input work is lost due to factors such as friction, heat, and inefficiencies in the machine. This is known as the principle of conservation of energy.


Why is the output force always less than the input force of a third class lever?

The output force is always less than the input force in a third-class lever because the input force is applied closer to the fulcrum than the output force. This configuration allows for greater speed and range of motion, but at the cost of reduced mechanical advantage.


Is it true that work output of a machine is always less than work input because of energy lost due to friction?

Yes, it is true. Due to factors such as friction, heat generation, and other inefficiencies in the machine, some of the input energy is always lost to the surroundings rather than being converted into useful work output, resulting in the work output being less than the work input.