Mon Prof Augmenté
Arrows That Show Speed
The same ball is drawn at three points along a marked track, and each drawing carries an arrow pointing the way it moves. The arrow is longer where the ball moves faster, so the length of the arrow stands for the speed.
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Every lesson is open to everyone for 7 days after it is published. This one came out on September 8, 2026: its text stays readable here, and its picture opens with a subscription.
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Age 15: open this week
Browse Age 15
In the picture
- The red ball at the left end of the track, the slowest of the three.
- The short arrow above that ball, matching its small speed.
- The long arrow above the ball at the right end, matching its large speed.
- The tick-marked strip along the track, the scale the arrow lengths are read against.
Examples
- A speedometer needle swings further round the dial the faster the car goes.
- On a weather map, wind arrows are drawn longer where the wind blows harder.
Key takeaways
- Arrow length stands for how fast; the arrow head shows which way.
- Double the speed, double the arrow, using one scale for every arrow.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
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