Mr.Ilko
   Internal Force – is a force that one part of the    structure exerts onto another part of the    same structure    ◦ T...
   There are three main forces that act within a    structure   You can classify them by the direction in    which they ...
   Is a force that acts to squeeze an object or    push parts within an object together.   Solid structures usually resi...
   Is a force that acts to stretch and pull apart    something   It can cause lengthening and possibly    snapping of a ...
   Is a force that acts to push parts that are in    contact with each other in opposite directions   Structures with pa...
   When different kinds of internal forces act on    a structure at the same time they are called    complementary forces...
Unit d  - section 2.3 -- external forces
Unit d  - section 2.3 -- external forces
Unit d  - section 2.3 -- external forces
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Unit d - section 2.3 -- external forces

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Unit d - section 2.3 -- external forces

  1. 1. Mr.Ilko
  2. 2.  Internal Force – is a force that one part of the structure exerts onto another part of the same structure ◦ These are also known as forces that act within a structure ◦ EX. Press the palms of your hands against one another and push
  3. 3.  There are three main forces that act within a structure You can classify them by the direction in which they within the object The three are; ◦ Compression ◦ Tension ◦ Shear
  4. 4.  Is a force that acts to squeeze an object or push parts within an object together. Solid structures usually resist the force of compression due to the strong materials they are made from Structures with parts that must resist compression include the human body, chairs and shelves
  5. 5.  Is a force that acts to stretch and pull apart something It can cause lengthening and possibly snapping of a component Structures that have parts that resist tension include ski lifts, hydro towers and running shoes
  6. 6.  Is a force that acts to push parts that are in contact with each other in opposite directions Structures with parts that must resist shear include doors, airplanes, and scissors
  7. 7.  When different kinds of internal forces act on a structure at the same time they are called complementary forces Bending is an example of this at work, both compression and tension are involved ◦ If the load is too great the beam may break By looking at were breaks occur, engineers can improve a structure

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