basic forces/friction

[nycon]

Hello, I'm on my way to having a test on "Forces/Friction" very soon in the future, but the thing is Im stuck :( my teacher wont really help me out. He only states the answer doesn't show how to achieve it at all. So I was wondering if anyone could tell me some basic formulas, and examples that could help me out?


Thanks John

[Pyrrhus]

All you need to learn for Linear Dynamics, also learn how to do Free Body diagrams.

Newton's 1st Law

\sum_{i=1}^{n} \vec{F}_{i} = 0 \rightarrow \vec{v} = constant

Newton's 2nd Law

\sum_{i=1}^{n} \vec{F}_{i} = m \vec{a}

Newton's 3rd Law

\vec{F}_{12} = -\vec{F}_{21}

Friction Force Magnitude

F_{f} = \mu N

[Tanya Back]

WOW same here..i am having a test on friction/forces very soon too! and i also got a teacher dat sucks!