Force - A push or a pull, Magnitude - STRENGTH of a force, Newton - Standard unit for measuring forces, External force  - force applied to a structure from an OUTSIDE source, Gravity - pulls all objects towards the Earth, Mass - the amount of matter in an object, Center of gravity - imaginary point where gravity pulls down on an object, Symmetry - mass is BALANCED on either side of a line or around an axis, Internal force - forces that act WITHIN a structure, Compression - force that SQUEEZE an object , Tension - force that STRETCHES or PULLS an object apart, Shear - force that PUSH parts in contact with each other, in opposite directions, I-beam - beams shaped like an 'i', Suspension bridge - hangs between two tall towers that support cables to hold up the bridge, Truss bridge - bridges made of TRIANGULAR frames, Beam bridge - simple FLAT bridge that is supported by the ground at each end, Cantilever - a beam that is supported at only one end, Column - a solid structure that can stand by itself,

Structures Topic 2 Intro

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