Kilometres per hour

Imagine you're on a super-fast scooter! Kilometres per hour (km/h) is like a special ruler for speed. It tells us how many kilometres you can travel in just one hour. If a car is going 50 km/h, it means it can drive 50 kilometres in the time it takes to watch your favorite cartoon episode! It’s a way to understand how quickly things are moving, from speedy race cars to slow snails.

People have always wanted to know how fast things move. Long ago, they used to measure speed by how far a horse could run in a certain time. But as cars and trains were invented, they needed a better way. Kilometres per hour became popular because a kilometre is a good size to imagine – about as long as 10 football fields! It helps us picture distances easily.

Knowing speed helps us everywhere! When you see a speed limit sign, like 30 km/h, it’s telling drivers to go that fast to stay safe. It also helps us know how long a trip will take. If you're going on a road trip, knowing the speed helps you guess when you'll get to your destination. It’s like a secret code for how fast the world is whizzing by!

Think about a speedy cheetah – it can run up to 100 km/h! That’s super fast! A regular car on the highway might go around 100 km/h too. But a slow-moving snail travels at about 0.05 km/h. That’s so slow, it would take ages to cross a playground! So, km/h helps us compare how fast different things are.