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OpenStudy (anonymous):

All working systems lose useful work output to ______. A) themselves B) energy C) machines D) friction

OpenStudy (anonymous):

I need the answer to this please

OpenStudy (espex):

What is the one force, that without there would be no movement, but this force also hinders movement.

OpenStudy (anonymous):

frction

OpenStudy (espex):

Exactly.

OpenStudy (anonymous):

Is that it or is there one more

OpenStudy (anonymous):

only fric i guess

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