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Structures and mechanisms
Structures and mechanisms
Forces, stresses and strength
· Force: Strength or power exerted upon an object; physical coercion.
· Stresses: are the physical demands that a body r object must withstand when one or more external forces are applied to it.
· Strength:is its ability to withstand external forces without breaking.
Definition and types
Conditions for strong structures
Types of stress:
· Is a collection of elements arranged in an optimum way to support a body or object.
Suspended
Types:
Mass
Material Behaviour when the force is applied Examples
- Rigid Does not form Table
- Elastic Deforms but then returns to its original shape Rubber
- Plastic Deforms and stays deformed Plasticine
Truss
Frame
The strength of a strucure depends on:
Elements that increase stability
·The types of forces applied and the points where they act
·The shape of the structure and the elements that form it,as well as the type of material that they are made of.
Stable: A structure is stable when it remains in equilibrium even when a force is applied to it.
Centre of gravity: is the point where the weight of an object is considered to be concentrated.