Physics- Density/Voume/Mass, Electric charges, Movement/Aceleration/etc., SI units, Scientific Notation and Prefixes

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Density formula

mass/volume

measuring volume with water

Volume w/ object - volume w/o object = volume of object

less dense

float

more dense

sink

like charges

repel

unalike charges

attract

closer the charges

greater force between the charges

normally atoms have _ net charge

0, because they have an equal amount of protons and electrons

charged object

Matter with a surplus or deficiency of electrons.

uncharged object

equal number of electrons

rubbing materials does not create electric charges. it_

seperates them

Insulator

A material that does not allow heat or electrons to move through it easily.
eg. polythene, glass, rubber

semiconductor

poor conductors when cold better when warm
eg. silicon, germanium

conductors

materials that allow heat and electricity to flow through them easily
good eg. metals, carbon
poor eg. water, human body, earth

earthing

When something is connected to the Earth by a conductor so that electric charges can flow between it and the Earth.
eg. planes

induced charges

Charges that appear on an uncharged object because of a charged object nearby

Acceleration

change in speed/time

speed

distance/time

Final Velocity

Starting velocity + (acceleration x time)

Resultant force

mass x acceleration
change in momentum/time

weight

Mass x gravitational force

momentum

mass x velocity

Velocity vs. Speed

Velocity- vector (measures speed AND direction)
Speed- scalar

Vector

yes direction

Scalar

no direction

negative acceleration

deceleration, retardation

uniform acceleration

constant acceleration

mass SI unit

kilogram (kg)

Length SI unit

meter (m)

Time SI unit

seconds (s)

Charge SI unit

coulomb (C)

electric current SI unit

ampere (A)

giga (G)

billion (10^9)

mega (M)

million (10^6)

kilo (k)

thousand (10^3)

deci (d)

tenth 10^-1

centi (c)

hundredth (10^-2)

milli (m)

thousandth (10^-3)

micro (μ)

millionth (10^-6)

nano (n)

billionth (10^-9)