Quick Notes

Quick Notes

Science Chapter 12: Stability and Strength
12.1 Stability and Strength of Objects and Structures
 
There are various strong and stable structures around humans. Among the examples that can be seen are the Pyramids in Egypt in the shape of a pyramid and the Igloo in the polar region in the shape of a hemisphere. In this chapter, students will learn more about the factors that affect the stability and strength of objects and structures as well as the importance of strong and stable structures.
 
12.1  Stability and Strength of Objects and Structures
 
Strong and stable structures are secure, firm and does not collapse or topple easily.
 
Stability of an Object and Structure
     
  The ability of objects and structures to remain or return to their original position  
 
 
Factors Affecting the Stability of Objects and Structures
     

The height of the object

  • The lower the object, the more stable it is
 

Base area

  • The larger the base area, the more stable it is
 
The strength of objects and buildings is the ability of objects and buildings to withstand forces that will damage or change the shape of the structure of the objects and buildings.
 
Factors Affecting the Strength of Objects and Structures
     
Types of materials

1. Concrete

  • Concrete is stronger than wood. Concrete can be molded, does not burn, does not decay and does not rust

2. Steel

  • Steel is stronger than wood. Bridges made of steel are stronger than wooden bridges
 
Shape of structure

1. Tunnel

  • The tunnel is built with a curved shape to make it stronger

2. Dome

  • The hemispherical shape of the dome makes it strong and does not require pillars for support
 

The importance of strong and stable structures

  • Can be used for a long time
  • Low maintenance costs
  • Not easily damaged
  • Safe to use