#notes on physics

-- light is not matter because it has no mass

-- light is a form of electromagnetic radiation

-- travels at a constant speed through space of 3 x 10^8 m/s, or 186,000 mi/s

-- a flash of light made at the equator could travel around the world in 1/7 of a second

-- sound travels more slowly so, for example, you would see a firework before hearing it

-- a photon is a particle of light

-- the amount of energy carried by a photon depends on the wavelength      -- violet light has a shorter wavelength than red light      -- violet light carries more energy than red light

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Electrostatic = electricity at rest

Conduction = when objects are in direct contact with each other, electrons move from one to the other

Friction = rubbing two surfaces, and electrons move from one surface to another

Ohms = units for electrical resistance

Amperes = units for current

Conductor = a material that allows electrical current to pass

Insulator = a material that doesn’t allow electrical current to pass

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