Effect of Friction On Galilean Predictions
Actual results from objects moving down inclined planes can be predicted very accurately by calculating the effect of friction upon the result predicted by Galileo. This is done with the simple formula F(fr)=μ(k/s)*F(n), where the force of friction is equal to the static or kinetic friction coefficient times the vertical normal force of the object against the plane. Unless in a vacuum, a (usually) small amount of potential energy is also lost to air drag.
Read more about this topic: Frictionless Plane
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