## Solving for time

Rate, or speed, is equal to distance traveled divided by time. To solve for time, divide the distance traveled by the rate. For example, if Cole drives his car 45 km per hour and travels a total of 225 km, then he traveled for 225/45 = 5 hours.

## Calculating average velocity or speed

Although speed and velocity are often words used interchangeably, in physics, they are distinct concepts. Speed is calculated by dividing the distance traveled by time. It does not have direction. Average velocity is the displacement (change in position) divided by time.

## What is displacement?

In physics, we love to precisely describe the motion of an object. Seriously, the first few chapters of basically every physics textbook are devoted to teaching people how to precisely describe motion since it is so important to everything else we do in physics. But to describe an object’s motion, we have to first be […]

## Introduction to reference frames

How the choice of reference frame is related to speed and velocity measurements.

## Intro to vectors and scalars

The difference between vectors and scalars. ​Introduction to distance, displacement, speed, and velocity.