# Lecture 5e - Texas Tech Physics & Astronomy

Inclined Plane Problems Tilted coordinate system: Convenient, but not necessary. Understand F = ma & how to resolve into x,y components in the tilted coordinate system!! By trigonometry:

FGx= FGsin() = mgsin() FGy= FGcos() = -mgcos() FG = mg You MUST understand this case to

understand the case with friction!! By geometry, the 2 angles marked are the same! Example Is the normal force FN equal & opposite to the weight FG?

NO!!!!!!!!!!!! F = ma Example x: mgsin Ff = ma y: FN - mgcos = 0 Friction: Ff = kFN NOTE:

FN = mgcos mg THE NORMAL FORCE IS NOT EQUAL TO THE WEIGHT!!!

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