UNIT 10

STRENGTH and STABILITY

Lesson 1 : I SEE SHAPES

CONE CUBE CUBOID

CYLINDER

HEMISPHERE

SPHERE

PYRAMID

Lesson 2 : STANDING TALL and LYING LOW

There are a numbers of factors which affect the stability of an object.

1. The base area.> The bigger the base area, the more stable the object is.

2. Height> The higher the object, the less stable it is.

3. The materials used.> Example of materials used for construction are concrete, wood, steel and plastic.

BASE AREA

A bottle in an upright position has a bigger base area. It is therefore more stable than a bottle in

an upside down position.

A low stool is more stable than a high stool

height

Materilas used

Concrete is very strong and can be formed into any shape

Wood does not break easily

Steel is the strongest material available

Plastic can be strecthed and pulled