physics Flashcards
what are the 2 types of electric charge
positive and negative
what happens when you rub balloons to you hair
it charges up the balloon
what does an electric field do
it pulls things up
whats an gravitatinal field
it pulls things down
whats electricity
a flow of charge through a circuit
where do electrons get energy from
.battery
.cell
.or power supply
what do opposites do
attract
why do electrons move from positive to negative
because negative electrons are repealed by the negative end of the battery and is attracted to the positive end of the circuit
whats a series
a circuit in witch are joined in a single loop
what does parallel mean
loops more than one branch in a circuit
what does the PD across each components add up too
the PD across the battery
whats an ammeters job
to measure an electric current
whats a volmeaters job
to record to potential difference
whats a current
the flow of electrons being taken around the circuit
what does resistance mean
is the opposition to the flow of the charge
what directions do all magnetic field lines point
south
what is energy measured in
kilo jewels (kj)
what cant energy do
be created or destroyed
what can energy do
be transferred from 1 store to another
what is atomic/nuclear
stored inside atoms
whats gravitational potential
objects in high positions
what does chemical mean
food,fuel batterys
what does kinetic mean
moving objects
what does thermal mean
hot objects
what does elastic potential mean
stretched object
what can energy be transferred between stores by
electricity
light
sound
heating
what energy store is a kettle
thermal energy store
what do you use to measure heat
thermometer
what does conduction happen in
solids
what does convection happen in
liquids
what are non renewable gasses
there gasses that run out
what are some non renewable gasses
fossil fuel
coal
oil
what are the advantages of non renewable gasses
it generates electricity
dissent release sulfur not expensive
what are dis advantages of non renewable gasses
will run out
increases global warming
releases carbon dioxide
toxic waste in environment
what goes at the top of an equation triangle including time power and energy
energy
what goes bottom left and right on a equation triangle including power time and energy
bottom left: power
bottom right: time
what are particals doing inside a blowen up baloon
mooving and coliding
how would you work out the power if the time was 40 sec and the energy was 70 j
firstly you ewould do energy devided by time as thats how it is on the triangle so it would be 70 divided by 40 wich is 1.75
if a balloon was deflated what would the particalls do
slow down
when do objects float
when the upthrust is the same size as the weight
what is pressure
Pressure is a measure of how much force is applied over a certain area
the bigger the weight equals to
the bigger pressure
bigger surface area equals to
smaller pressure
when do solids not sink
when the surface area is the same size as the weight
what goes at the top of the equation triangle if the units are force pressure and surface area
force
