y10 science revision Flashcards
chemical energy stores
includes fuel and food. the energy is transferred during chemical reactions
kinetic energy stores
describes a moving object
gravitational energy stores
describes the energy an object has if it raised above the ground
elastic potential energy
describes the energy stored in a springy object when you stretch or squash it
energy transfer
energy can not be created or destroyed only transformed from one form to another
internal energy store
energy stores in the movement of particles. combination of kinetic energy & potential energy of moving particles
joules
unit of energy: one joule (1J) of work is done when a force of one newton (1N) causes a displacement of (1M) 1 joule - 1 newton-metre
friction
a contact force. work to overcome this is mainly transferred to thermal energy
closed system
no net change in the energy of a system
work done
another way of describing energy transfer
output energy
the energy given out of a device (useful or wasted)
input energy
the energy supplied to a device
non- renewable
a resource that cannot be replaced after it has been used
renewable
resources that can replenish themselves
fossil fuel - oil, coal, gas
used in industry & transport. cheap to mine. pumped out of the ground in pipes. limited supply and gives off CO2
