Speed

What Is Speed?

Speed is how fast something moves. It tells us how far an object goes in a certain amount of time. For example, if a toy car moves 10 steps in 2 seconds, its speed is 5 steps per second.

People measure speed in different ways all around the world. Some places use metres per second, while others use kilometres per hour or miles per hour. When you see a speed limit sign, it usually tells you how many kilometres or miles you can go in one hour.

Fun Facts About Speed

Did you know that the fastest thing in the universe is the speed of light? It moves so fast that it can go around the whole Earth seven times in just one second! But nothing with mass, like a car or a person, can ever go as fast as light.

A long time ago, a smart man named Galileo Galilei started studying speed. He would measure how far something went and how long it took. This helped people learn more about how things move.

Different Kinds of Speed

Sometimes we talk about average speed. This is the total distance something traveled divided by the time it took. For example, if you ride your bike for 2 kilometres in 10 minutes, your average speed is 12 kilometres per hour.

We also talk about instantaneous speed. This is how fast something is moving at one exact moment. You can see this on a speedometer in a car. It shows how fast you are going right now, not over a long time.

Everyday Examples

• A snail moves very slowly, about 0.003 feet per second.
• A person walking usually goes about 5 feet per second.
• A car on a highway might go around 45 feet per second.
• A plane in the sky can zoom at over 800 feet per second!

Speed is all around us, from the slow crawl of a snail to the fast flight of a plane. It helps us understand how the world moves!