GUIDE深度 · Deep dive
Physics Formulas and Units
Unify units first: cm to m, g to kg, min to s. Then choose the formula and check the magnitude. Speed m/s, density g/cm³ or kg/m³, force N, work J, power W, pressure Pa.
Formulas
v=s/t; ρ=m/V; F=ma; W=Fs; P=W/t; p=F/A.
G=mg; Ek=½mv²; Ep=mgh; Q=cmΔT.
Units
1 m = 100 cm; 1 kg = 1000 g.
1 h = 3600 s; 1 kW = 1000 W.
FAQ
Formula or units first?
Unify units, then substitute, to avoid magnitude errors.
How many decimals?
Usually two; follow the question if specified.