Need equation for converting force into normal space and back

Blitz3D Forums/Blitz3D Programming/Need equation for converting force into normal space and back

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sswift
 #1
"A coefficient of -1.0 would reduce that
component to nothing."

Which is what I guessed would happen so I went:
V = V - (1.0 + Elasticity)*(VdotN)*N


"An addition -1.0 makes it negative its old value."

Huh? Show me the equation.