# Speed conversion

### Speed / Velocity conversion

Speed and velocity are two fundamental concepts in physics that describe the rate at which an object moves. While they are often used interchangeably in everyday language, they have distinct meanings in the realm of physics. Speed refers to the magnitude of the rate of motion, while velocity includes both the magnitude and direction of the motion.

Most of the units of speed are compound units of distance by time, for example the SI unit meters per second. Notable exceptions to this are Mach (a unit based on the speed of sound) and Knots (which is actually Nautical Miles per hour).

When it comes to converting speed or velocity from one unit to another, it is essential to understand the different units commonly used. In the metric system, the most commonly used unit for speed is meters per second (m/s). However, other units such as kilometers per hour (km/h) and miles per hour (mph) are also widely used.

To convert speed from one unit to another, you can use conversion factors. For example, to convert from meters per second to kilometers per hour, you can multiply the speed value by 3.6. Conversely, to convert from kilometers per hour to meters per second, you divide the speed value by 3.6. Similarly, to convert from miles per hour to meters per second, you multiply the speed value by 0.447.

### Metric measurements of Speed and Velocity

Metric measurements of speed and velocity are widely used around the world due to their simplicity and consistency. In the metric system, speed is typically measured in meters per second (m/s) or kilometers per hour (km/h). Meters per second is the preferred unit for scientific and engineering applications, while kilometers per hour is commonly used in everyday life.

The unit of meters per second represents the distance travelled in meters divided by the time taken in seconds. This measurement is particularly useful when precise calculations are required, such as in physics experiments or engineering designs. For example, the speed of a moving car or the velocity of a projectile can be accurately determined using meters per second.

Kilometers per hour is a more practical unit for everyday situations. It represents the distance travelled in kilometers divided by the time taken in hours. This unit is commonly used in traffic regulations, weather reports, and sports events. For instance, speed limits on roads are often given in kilometers per hour, and weather forecasts may include wind speeds in this unit.

### Imperial / American measurements of Speed and Velocity

Imperial and American measurements of speed and velocity are commonly used in the United States, the United Kingdom and a few other countries that have not adopted the metric system. In these systems, speed is typically measured in miles per hour (mph), while velocity is measured in feet per second (fps).

Miles per hour (mph) is a unit of speed commonly used in the United States. It represents the distance travelled in miles over the course of one hour. This measurement is widely used in everyday life, such as when driving a car or determining the speed of a moving object. For example, a speed limit sign on a highway might indicate a maximum speed of 65 mph.

Feet per second (fps) is a unit of velocity commonly used in engineering and physics. It represents the distance travelled in feet over the course of one second. Velocity, unlike speed, takes into account the direction of motion. For example, if an object is moving at a velocity of 10 fps north, it means that it is moving 10 feet northward every second. This measurement is often used in scientific calculations and experiments.

### Converting acceleration as opposed to speed

When it comes to understanding the difference between speed and acceleration, it is important to recognize that these are two distinct concepts in the realm of physics. Speed refers to the rate at which an object covers a certain distance, while acceleration refers to the rate at which an object's speed changes over time. In other words, speed measures how fast an object is moving, while acceleration measures how quickly its speed is changing.

Acceleration units have an extra time element in the denominator. For comparison, meters per second (m/s) measurement of a speed would typically be associated with an acceleration unit of meters per second per second (m/s²). To convert acceleration from one unit to another, you need to use conversion factors that take into account the relationship between the units of length and time.