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Forces Acting on Structures

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Ryan Wong

on 6 June 2014

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Transcript of Forces Acting on Structures

What is a Force?
A force is any external or internal push or pull that can cause a change in an object's direction, movement, or geometrical construction. There are external and internal forces.
External Forces
There are external forces all around us. Forces that act on an object from outside the object is an external force.
Examples of external forces are wind and gravity.
Natural force of attraction between two objects is gravity. Gravity causes objects to fall when dropped from a height. If we humans did not have gravity we would be floating around all over the place. In space there is no gravity. Gravity is an external force.
Symmetry is balanced arrangement on opposite sides of a structure (equal halves). When you see your reflection in a mirror or a lake that is symmetry. In art you can draw symmetric drawings. Asymmetric is the opposite of symmetric.
Load is an external force acting on a structure. Total load is the sum of static and dynamic load. What is dynamic and static load though? Dynamic load is forces that move or change while acting on the structure. Static load is the effect of gravity on the structure. Weight of a bridge is a static load. Weight of a truck on a bridge is a dynamic load.
Internal Forces
Torsion or Torque
Torsion is a type of internal force that twists a structure. When you twist open the cap of a water bottle or a bottle of soda, you are applying the force torsion to the bottle cap.
Shear is a type of internal force that pushes a structure in opposite directions. When you cut paper with scissors and the paper goes in two different directions that is an example of shear.
The End
Forces Acting
on Structures
Internal forces are when one part of a structure acts on another part of a structure. Internal forces are sometimes called resisting forces because they can resist effects of external forces.
Tension is a type of internal force that stretches a structure apart to expand or lengthen it. Stretching a rubber band is an example of tension because you are lengthening the rubber band.
Compression is a type of internal force that squeezes or presses a structure together. When you squeeze lemons to add flavour to your food that is an example of compression.
This summarizes forces that are internal and external. Thank you for listening to my presentation.
By Ryan Wong 7G
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