# US Standard Speed (Velocity)

These are the most common measurements:

**Feet per Second (fps)****Miles per Hour (mph)**

### Speed in feet per second (fps)

If something is traveling at 1 fps it moves **1 foot every second**.

It is a **very slow** walking pace.

An hour and a half at 1 fps moves you about 1 mile.

### Speed in miles per hour (mph)

If something is traveling at 1 mph it moves **1 mile every hour**.

It is a **slow** walking pace.

One hour walking at 1 mph moves you 1 mile.

Miles per hour is often used for car speeds.

Example: Highway speed is around **60 mph**

One **minute** at 60 mph will move you **1 mile**.

## Converting

You can convert from fps to mph:

- 1 mph = 1.4666... fps
- 1 fps = 0.68181818... mph

### Example: What is 60 mph in fps?

A mile has 5,280 feet, and an hour has 3,600 seconds, so 60 miles per hour is:

- 60 x 5,280 / 3,600 = 88 fps

60 mph = 88 fps

## Velocity

Velocity is speed with a **direction**.

So if something is moving at **5 mph** that is a **speed**.

But if you say it is moving at **5 mph westwards** that is a **velocity**.

If something moves backwards and forwards very fast it has a high speed, but a low (or zero) velocity

## More Examples

60 mph is about:

- how fast you can legally go on a highway
- the maximum running speed of a cheetah
- the speed needed to drive one mile in a minute
- half the freefall speed of a skydiver

35 mph is about:

- the speed limit in the city
- going very fast on a bicycle
- the speed of a racehorse on a short track
- full running speed of a Bengal Tiger

1 foot per second is:

- exactly 0.3048 meters per second
- approximately 0.6818 miles per hour
- exactly 1.09728 km per hour