physics
how is energy transfered?
mechanically(by a force doing work),electrically(work done by moving charges),by heating or by radiotion ( eg light and sound
name the 8 energy stores
thermal kinetic gravitational potential elastic potential chemical magnetic electrostatic nucluear
what is a system?
a single object or a group of objects
when a system changes energy is ________
transferred
what are closed systems in energy stores and systems?
systems neither matter nor energy can enter or leave. the net change in the total energy of a closed system is always zero
give an example of energy being transferred by heat
boiling water in a kettle where water is the system.
work done is just another way of saying ______ ___________ (they are the same thing)
energy transferred
work can be done when _______ ______ or by a force moving an object
current flows
all substances are made up of ______
atoms
what do atoms contain?
protons neutrons and electrons
what is in the middle of an atom?
nucleaus
where do the electrons move around in the atom?
the nucleus
what is a protons charge?
+1
what name is given to group 0 on the periodic table?
noble gasses