Physics EOY thing Flashcards
If a question talks about pressure and volume, what formula will you most likely have to use?
Boyles Law - P1V1 = P2V2
What is friction
friction is a force betweem two objects moving while in contact with each other, with acts to slow down the motion. It converts KE to heat energy
How do you calculate work done by a force?
Force(N) x distance moved (m)
What formula would you use if you wanted to work out how much energy something gains by being heated?
Energy = mass x SHC x temp change
How would you work out SHC?
SHC = energy in joules/mass x temp change
What are the main heat transfers?
Conduction, convection, radiation, insulation
WHat is the best absorber of radiation
matte black
What is the worst absorber of radtion
shiny silver
What is heat energy?
the total kinetic energy of random thermal motion of all the particles in an object
What is the formula for density?
density= mass(g or kg)/volume(cm3 or m3)
What does internal energy equal?
internal energy = kinetic energy + potential energy
WHat happens when a substance is changing state from solid to liquid?
The bonds between the partciles are breaking. this takes energy from the heat source and so the temperature stops going up until all the bonds are broken
What happens when a substance is changing state from gas to liquid?
Bonds are being formed, which releases energy and so it keeps the temperature constant until all the new bonds are formed
If it involves a change of state, what formula are you most likely to use?
energy = mass x specific latent heat
When does Boyle’s Law work?
It only tells us the relationship between the pressure and volume at a CONSTANT temperature?
What does kinetic energy/ gravitational potential energy equal?
0.5mv2
