2
Things that slide
Joyful Mathematics: Chapter 2
GoalTell which things slide and what helps them slide.
New words
slide · move along a surface without turning oversmooth · even to touch, with no bumpsrough · bumpy, not smooth
Explanation
A thing slides when it moves along a surface. A box slides when you push it on the floor. A child slides down a slide. A bar of soap slides in the bath. A smooth floor helps things slide. A rough floor stops them.
Worked examples
A box slides when we push it on a smooth floor.
A child sits at the top of a slide. She slides down.
It is easy to slide a box on a smooth floor. It is hard to slide it on rough, sandy ground.
Class activity
Slide test. Push a book or a plastic box along different floors or tables: a smooth table, a carpet, a rough mat. Where does it slide the most? Where does it stop quickly?
Practice
1
Does a wet bar of soap slide on a smooth floor?
Yes, it slides very easily.
2
On which floor does a box slide more easily: a smooth floor or a rough floor?
A smooth floor.
3
Which one slides when you push it on a table: the book or the tennis ball?
The book. The tennis ball rolls.
4
Can you slide a book on a table?
Yes.