Physics
Electricity and magnetism
Electricity
AC current Tesla
electric current that reverses its direction many times a second
Usally used for power supplys
Exaple would be for a power house to supply energy
to the city
people didnt know alot
about AC so they didnt
know how to use it and
control it
DC current edison
Only flows in one direction
Used for DC motors
Safer
form of energy in charged particles
magnetism
The movement of the electrons result in the
atomic scale
One exapmpel for this is a regular magnet.
you can used this to hang stuff on the fridge.
People at junk yards use really strong magnets
to pick up cars to put them into the crusher
light
Electromagnetic waves
A wave of light
Changes in color and brightness
Doppler effect is an example
for change in color
the light traveling past a person appears redder
than if it was traveling towards you which would
be bluer
The brightness changes by the amplitude of the wave
Vision
Subtopic
Sound
Mechanical waves
any wave that traves through a medium
ex. when you throw a rock into the water and the water starts to ripple
Hearing
1. outer ear
Pinna
auditory cannal
ear drum
2. Middle ear
Three bones
3. inner ear
cochlea
cilia
4. brain
Changes in pitch and volume
Pitch
how high or low a sound is
Volmume
constructive interfernce
amplify each other
amplitude
amount of energy in a wave
Force and motion
Newtons Laws
Law 1
A body in stays in motion unless acted upon
Evidence: This is like when you
slam on your brakes and your seat
belt saves you from slamming into the
front dash
Forces balanced
/Object\
rest motion
/ \
stays stays
law of inertia
Law 2
force=newtons
Force = Mass X Acceleration
Law 3
For every force there is an
equal/oppstite reaction force
Energy
Kinetic
Energy in motion
Ex: skateboard in motion
potential
possible energy at a certain point
Skatebord makes this when stopped
thermal
energy realesed from friction
total
Kinetic+ potential + thermal
Friction
resistence of an object
1`
Gravity
Force that pulls you to the center of the earth
ex: when you kick a ball up in the air and when it comes back down that is because gravity is pulling it down.
impulse and momentum
impulse
change in momentum
Ex: your car moving in one direction
and a bug going towards your car hits your window
momentum
mass in motion
EX: your car moving