# Differerential Equations

- The derivative can be thought of as the slope of a curve.
- If you have an equation for velocity, you can get the location
by integrating.
- A simple way to approximate this is to time slice it.
- If the forces on an object are constant, you integrate by mutliplying.
- Since gravity on earth is -9.81 m/s^2, an apple dropped from a tree
at one time will be travelling at -9.81m/s after one second
and -19.62m/s after two.
- More complex equations (than constant) require solving of
differential equations.
- Palmer provides a link to a series of equations for solving
these equations.
- Libraries exist.
- If you really need to do this, you're going to have to
start exploring calculus.