physics ch. 12
Terms
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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