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Roll, slide or both?
Joyful Mathematics: Chapter 2
GoalSay whether a thing rolls, slides or does both.
New words
both · two things togetherroll · turn over and overslide · move without turning
Explanation
A ball rolls. A box slides. A tin can do both. A tin lying on its side rolls. A tin standing on its flat end slides. A coin lying flat slides. A coin on its edge can roll. Try it and see!
Worked examples
A tin lying on its side rolls. The same tin standing up slides.
A coin lying flat slides. A coin on its edge rolls.
A brick slides but does not roll.
Class activity
Roll or slide? Collect 8 things: a ball, a tin, a book, a box, a pencil, a spoon, a coin, an orange. Push each one. Make three groups: rolls, slides, both. Say what you notice.
Practice
1
Does the football roll, slide or both?
It rolls.
2
Does the candle roll, slide or both?
Both. It rolls on its side and slides standing up.
3
A tin is standing up. You push it. Does it roll or slide?
It slides.
4
Write R for rolls, S for slides, B for both: orange, brick, drum.
Orange R, brick S, drum B.