| CATEGORY |
SYMBOL or TAG |
| General Force |
F |
| Weight/Gravity |
W = mg |
| Tension in Cord/Rope |
Fc = T |
| Human Push or Pull |
Fapp |
| Surface Friction |
Ff = f = m n |
| Normal Contact Force |
n |
| Spring |
Fs = -k s |
| Air Drag |
FDrag = Fair =1/2 C A v2 |
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