# Guides

## Free-Fall Motion (Mapped Solution)

There are many techniques to use to solve physics problems. One of my favorites is drawing flow-chart-like diagrams showing paths to solutions. The resulting “maps” are great visual summaries of the mental thought processes that went into solving the problems. Below is an example. At first glance it may seem overwhelming and confusing. Take some

## Projectile Motion (Video)

In this guided practice, I work through a projectile motion problem involving the level horizontal flight of a water balloon. I end up deriving an expression relating the range, launch angle, and initial speed of a projectile undergoing level horizontal flight. Level horizontal flight is the situation where a projectile takes off and lands at

## Coulomb’s Law of Electrostatic Interaction (Video)

In this problem we must use Coulomb’s Law to find the charge of two spheres. You do not know the charge or each sphere, but you are given the total charge of both. You are also given the distance between then and the magnitude of the electrostatic force each exerts on the other. The solution