material world
what is an ion
a particle with unequal protons and electrons
what is permafrost
frozen land
3 types of guiding control
translation, helical, rotational
what is more electronegative, rubber or cotton?
rubber
how to identify a salt
presence of a metal and non metal
what is the greenhouse effect
natural process that allows the earth to retain some of the heat it receives from the sun
name 3 motion transmission systems
ex. gear trains, friction gears, wheel and worm gear, chain and sprocket, belt and pulley
another word for voltage
potential difference
3 types of static electricity
friction, conduction, induction
2 types of currents
surface currents and subsurface currents
name 3 motion transformation systems
ex. rack and pinion, screw gear, cam and follower, slide and crank
the way in which we represent the units for power
watts
4 family names on the periodic table
alkali metals, alkaline earth metals, halogens, noble gases
thermohaline circulations and what they do
responsable for major transfers of heat around the world
name the 5 constraints
torsion, compression, shearing, tension, deflection
what is the resistance triangle
r=v/i
name 6 electrical functions
power supply, conduction, insulation, protection, control, transformation of energy
what is it called when there are small free floating sheets of ice in the poles
ice flows
equation for gear ratios
driver diameter/ driven diameter
4 ideal factors for conductance
fat, short, copper, cold