STRUCTURES

STRUCTURES

DEFINITION: object made of a particular shape who is made in order to protect another thing, support something, to help people, etc.

NATURAL STRUCTURES: are structures made by the nature with natural things, structures that are not made by humans.

EXAMPLES:

Jeju island:                                      Iguazu falls:                      Mount Everest:

MAN-MADE STRUCTURES: are structures made by humans and can have a profit or just to make something beatiful.

EXAMPLES:

Eiffel Tower:                                                              Big Ben:    
                  
                          

AN AMAZING STRUCTURE !:

Burj Khalifa:

Types of forces:

FORCE: a force is to make some effort to an object.

Contact Forces: 

-Tension Force
-Friction Force
-Normal Force
-Air Resistance Force
-Applied Force
-Spring Force  

Distant Forces: 

-Electrical Force
-Gravitational Force
-Magnetic Force  

Sources of information:

• http://www.macmillandictionary.com/
• http://listverse.com/2008/01/03/top-15-amazing-natural-wonders/
• http://www.listal.com/list/worlds-most-famous-landmarks
• http://www.youramazingplaces.com/top-10-strangest-buildings-in-the-world/
• http://www.physicsclassroom.com/class/newtlaws/Lesson-2/Types-of-Forces