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Unit D: Structures & ForceTopic 1.1 – Classifying
Structures Key Terms
Structure Force Stability Strength
Types of Structures Solid Frame Shell
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Need to Know Terms Structure
Any object that provides support
Can be made of one or many parts, may be large or small
A chair, a tree, a statue, a car, a rock, a bone….
Force A push or pull that can
cause and object to change its movement or shape
Structural Strength The ability of a
structure to support both its own weight plus any additional weight applied to it
Structural Stability The ability of a
structure to maintain its position even when it is being acted on by forces
To keep balanced and not get knocked over
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The Three Types of Structures1. Solid Structure
A structure made of a solid piece, or a solid combination of pieces, of strong material
2. Shell Structure A structure with a solid outer
surface and a hollow inner area
3. Frame Structure A structure consisting of a rigid
(firm) arrangement of parts joined together
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Solid structures have little or no space inside and are usually the strongest of
the three types
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The strength of frame structures comes from the way its parts are
assembled
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Shell structures are stronger than frame structures and lighter than solid
structures, which is why they are used for protection