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Blocks can be stalked easily but we cannot put a ball on
another ball without external support. This is because a cube

has a plane surface and a ball has a curved surface.

If a solid is made up of only plane faces, it slides.

Here, we can see that the pencil box has plane faces. So, the

box is sliding.

If a solid is made up of only curved
faces or surfaces, it rolls.

Here, we can see that the ball has only a curved surface.

So, the ball is rolling.

Some solids are made up of both plane and curved faces.
Such objects can

roll as well as slide.

Here, we can see that the juice-can has both
plane and curved surfaces. So, it is rolling

and sliding.

Practice Time 7D

1. Look at the given objects. Find which can roll, slide or stalk.

Object

roll

Slide

Stalk

2. Name and draw the shape that

(a) can slide and stalk but not roll. Project

(b) cannot slide or stalk but roll. Take a cardboard sheet/any hard
sheet and try to make an object
(c) can slide, roll as well as stalk. with (a) 4 faces (b) 1 face.

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