Physics UT HW. - Page 3

On October 27 2008 14:51 micronesia wrote:

Lol what? Serious question nestled in there?

Earth?

On October 28 2008 00:28 Klockan3 wrote:

I would guess that 0.6 is the static friction and 0.2 is the kinetic friction.

Since the crate is initially resting and 400 N is not enough to go above the static friction the answer must be: ???????

Edit: And for what to read to learn the linear algebra needed, read roughly everything in this that is not about matrixes:
http://en.wikipedia.org/wiki/Dot_product
The dot product is usefull all the time in mechanics since you need to constantly project forces on to surfaces or split them up to get the equations straight etc.

Might be a bit abstract but if you plan on doing something that requires college level math then there is no reason not to learn about it now, it is a powerful tool at the same time as the definition of it is really simple.