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physics ch. 12

Terms

undefined, object
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density formula
mass/volume (kg/m^3 or g/cm^3)
4 principal types of bonding in solids:
Ionic, Covalent, Metallic, & Van de Waals' (weakest)
atomic bonding
atoms tied together by electrical bounding forces
Metals, salts & most minerals (materials of the Earth) are made up of _____
crystals (these are arrangement of atoms very close together)
noncrystalline solids are..
amorphous, meaning atoms & molecules in a solid are distributed randomly (no orderly, repetitive arrangement) i.e. rubber, glass, plastic
weight density formula
[weight, not mass] weight/volume (N/m^3)
elasticity
property of material where it changes shape from exerted force then springs back to equilibrium
inelastic
materials that don't go back to original shape after being deformed
Hooke's Law
Force ~ d (amount of stretch or compression)
elastic limit
distance beyond which permanent distortion occurs (& object can't go back to original shape)
tension vs. compression
tension = pulled on/stretched. compression = pushed in/squashed
neutral layer
region where there is on tension or compression
scaling
study of how volume & size of an object affect the relationship of weight, strength, and surface area
strength: __ :: weight : _____
area of cross section (cm^2) l volume (cm^3)
Why do smaller foods cook faster?
have more surface area per kg

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