Junior high school physics work and mechanical energy formula summary, to formula with unit and unit conversion To formula with the unit and unit conversion, in junior high school textbook ninth grade Chapter 15. Trouble

1. Work w = FS
The unit of W is J (same as N.m, 1J = 1n.m)
The unit of F is n
The unit of S is m
2. Mechanical efficiency η = Wye / wtotal
When doing work in the vertical direction: w = GH
W is always the work of the first formula above, and W is the total work
3. Power P = w / T
The unit of P is watt
The unit of W is Joule
T is in seconds

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