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Sorting Things That Move Fast and Slow · Forces We Can Feel · speed · fast and slow

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Sorting Things That Move Fast and Slow

with Atlas

Atlas the robot stands on a sunny playground, arms wide open, watching a speedy bicycle zoom past a slowly crawling turtle on the path ahead.

Identify objects that move fast and objects that move slow.
Compare the speed of two moving objects and say which is faster.
Sort a group of moving things into fast and slow groups.
Explain in simple words what it means for something to move fast or slow.

Key terms

speed: how quickly something moves from one place to another
fast: moving quickly and covering distance in a short time
slow: moving gently and taking a long time to travel
compare: to look at two things and see how they are different
finish line: the spot where a race or trip ends

What Speed Means

Speed is a way of describing how quickly something travels. A fast thing covers a lot of ground in a short time, like a racing car that flashes past. A slow thing covers only a little ground in the same time, like a snail creeping along the sidewalk. Both are moving, but one is much quicker than the other.

How to Decide Which Is Faster

The best test is a fair race: start two things from the same line at the same moment. Watch which one reaches the end first. That one is faster. It does not matter how hard something tries or how big it is. What matters is who gets there first in the same amount of time.

Worked examples

A dog and a turtle both start at the gate at the same time. The dog reaches the tree first. Which one is faster?

Notice they both started at the same time and same place — that makes it a fair race.
See who arrives at the tree first.
The dog got there first, so the dog covered the distance in less time.

Answer: The dog is faster.

Hi there! I am Atlas, and today we are going to talk about speed! Speed tells us how fast or slow something moves. When something moves FAST, it gets from one place to another very quickly. A racing car zooms by — blink and it is gone! When something moves SLOW, it takes a long time to get somewhere. A snail inches along the ground — you can watch it the whole way. Here is a trick: if two things start moving at the same time, the one that reaches the finish line FIRST is the faster one. Starting together does NOT mean they move at the same speed! Look around you every day. A running dog is fast. A thrown ball is fast. A crawling tortoise is slow. A floating bubble is slow. We can sort all moving things into two groups: FAST or SLOW. Give it a try!

Activity

Drag each moving thing into the Fast group or the Slow group.

Practice

Name one thing that moves fast and one thing that moves slow.

Look at a running child and a crawling baby — which one is faster?

Common mistakes to avoid

Things that start at the same time move at the same speed.Starting together does not mean moving together — the one that reaches the end first is faster.
Trying harder always makes you the fastest.Speed is about how quickly you actually arrive, not about how hard you try to go.

Check your understanding

A rabbit and a turtle start running at the same time. The rabbit reaches the finish line first. Which one is faster?

Which of these moves SLOW?

A bicycle and a snail start moving at the same time. The bicycle reaches the corner first. Which one is moving faster?

Recap

Speed tells us how quickly something moves. Fast things cover distance in a short time, and slow things take longer. In a fair race that starts together, whoever reaches the end first is the faster mover.

Reflect

What is the fastest thing you saw move today?