General Physics Flashcards
What is internal energy?
the total energy of a substance/system’s particles have in their kinetic and potential energy stored
what is temperature?
a measure of how hot or cold an object is, also a measure of the average kinetic energy of the particles in the object
how do gas particles move?
in random directions at a range of speeds
What happens when a gas particle collides with a surface?
it exerts a force on the surface (this puts pressure on it)
what is gas pressure?
the total force exerted by gas particles colliding with the walls of their container
In a sealed container, what happens with an increase in temperature?
increase in temp
increase in kinetic energy of particles
increase in frequency of collisions and each collision of greater force
greater total force exerted on surface
increase in pressure
In a sealed container with a constant temp, what happens when the volume decreases?
decrease in volume
increase in frequency of collisions
greater total force exerted on surface
increase in pressure
What happens if work is done on a gas?
transfers energy to the gas
increases the internal energy of the particles (the average kinetic energy)
therefore increasing the average speed of the particles
what is boyle’s law?
pressure x volume = constant
pV = k
you can also use p1v1 = p2v2 to solve problems in this vein
what is atmospheric pressure?
100 kPa
equation for pressure?
pressure = force / area
when will an object float?
if its weight is less than its upthrust
which equation links mass, energy and specific latent heat?
E=mL
Energy=mass x specific latent heat
This one is about changes in state!!
what is specific latent heat of fusion?
change of state from solid to liquid
what is specific latent heat of vaporisation?
liquid->gas
