energy Flashcards
give some examples of energy stores (8)
- chemical
- kinetic
- gravitational
- thermal
- elastic
- magnetic
- electrostatic
- nuclear
what are the different types of energy pathways?
light, sound, mechanical, electrical, by heating
what is the law of conservation energy?
energy cannot be transferred usefully, stored or dissipated, but cannot be created or destroyed
what are the units for energy?
J or Joules
what is an equation linking kinetic energy, mass and velocity?
kinetic energy = 0.5 x mass x (speed)^2
when is energy stored in an elastic potential energy store?
when an object is deformed (stretched or compressed)
what is the equation linking elastic potential energy, the spring constant and extension?
elastic potential energy = 0.5 x spring constant x (extension)^2
when is energy stored in a gravitational potential energy store?
an object is raised above ground level
what is the equation linking gravitational potential energy, mass, gravity, and height?
g.p.e = mass x gravitational field strength x height
when is energy stored in a chemical energy store?
chemical bonds between molecules
when is energy stored in a thermal energy store?
an object is at temperature above absolute zero (-273’c)
when is energy stored in a kinetic energy store?
an object is moving
what is specific heat capacity?
the amount of energy required to raise the temperature of 1 kilogram of the substance by 1 degree celsius
what is the equation linking changing energy, mass, specific heat capacity, and change in temperature?
change in thermal energy = mass x specific heat capacity x temperature change
what is power?
the rate at which energy is transferred or the rate at which work is done
