- #1
fisico30
- 374
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Dear Forum,
in the case of ideal simple machines the input work is exactly ideal to the output work.
The efficiency is 100%.
In some cases the input power is equal to the output power, but not always: when we push a box up an inclined plane we need a smaller force for a longer distance. It will take a longer time (less output power hence) to push the block to the final height than if we simply lifted the block.
In the bicycle case instead, we have both input work=output work and input power= output power. Thanks to the chain, the work is transferred from the front wheel to the rear wheel in the same interval of time. There is some coupling.
How can we phrase the general requirement to achieve input power = output power in simple machines?
Any comment or correction?
thanks
fisico30
in the case of ideal simple machines the input work is exactly ideal to the output work.
The efficiency is 100%.
In some cases the input power is equal to the output power, but not always: when we push a box up an inclined plane we need a smaller force for a longer distance. It will take a longer time (less output power hence) to push the block to the final height than if we simply lifted the block.
In the bicycle case instead, we have both input work=output work and input power= output power. Thanks to the chain, the work is transferred from the front wheel to the rear wheel in the same interval of time. There is some coupling.
How can we phrase the general requirement to achieve input power = output power in simple machines?
Any comment or correction?
thanks
fisico30