Recent content by Alboin

Hi, I am wondering why normal forces 'are'? I mean, I know what they 'do', but why does a surface create a force when a force is put against it? Obviously, it follows Newton's law of equal and opposite reactions, but can anyone explain what happens, if even on an atomic level, to create...

Oh, I'm sorry. y = -4.9(x-1.55)^2 + k and friends are referring to distance\height in the air (y) versus time (x). So as time increases, the distance increases, but then falls again - a parabola.

Homework Statement A ball is thrown vertically into the air and is caught 3.1 seconds later. (This is just a basic linear motion question, so there are no 'advanced' considerations.) a) Find the velocity when the ball was thrown b) Find the max heightHomework Equations (Nothing really...