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# science ch 8

TermDefinition
force push or pull on an object
type A: contact tension, elastic, friction
type B: at-a-distance gravitational, electrostatic, magnetic
mass (kg, g) amount of matter in an object always stays the same
weight (N) amount of force on an object due to gravity changes depending on where you are in the universe
balanced forces equal in strength oppose each other in direction keep object moving at constant speed and direction
unbalanced forces cause change in speed or direction of an object
pressure amount of force acting on an area or an object increase pressure=smaller volume=particles closer together
formula for pressure P = F/A
compression decrease in volume from force
compressible: gasses? yes, large amount of space between particles
compressible: liquids? no, incompressible
compressible: solids? no, incompressible
kinetic energy in gasses when energy is added to a gas, the kinetic energy of the particles is increased warmer gas expands faster that cooler gas
gas in pressurized containers (aerosols) when aerosols are heated, pressure increases fast-moving particles bounce against sides of container could cause explosion
deformation change of shape without being forced into smaller volume
unit for pressure 1 N/m2 = 1 Pascal (Pa)
implosion collapse inward air pressure inside is lower than air pressure outside of container
viscosity fluid's resistance to flow liquid's viscosity decreases when heated, increases when cooled gas's increases when heated, decreases when cooled
adhetion attraction or joining two objects or fluids to each other
cohesion the strength with which the particles of an object or fluid attract each other
viscosity: the effects of particle shapes higher viscosity=more complicated shape of molecules
flow rate speed at which fluid flows from one point to another
surface tension property of a liquid in which the surface of it acts like a thin membrane or skin
Created by: majmun