The Physics
Hypertextbook
Opus in profectus

Forces

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Summary

Some common forces * Up for birds and planes, down for cars, sideways for curveballs.
name/symbols when/where direction
weight W, Fg due to gravity down
normal N, Fn surfaces in contact normal to surface
friction ƒ, Fƒ surfaces in contact tangent to surface
tension T, Ft strings, ropes, cables, etc along the axis
elasticity Fe, Fs springs, rubber bands, etc. along the axis
buoyancy B, Fb immersed in a fluid up
drag R, D, Fd moving through a fluid opposite velocity of object
lift L, F moving through a fluid perpendicular to flow*
thrust T, Ft pushing a fluid opposite velocity of fluid