energy stores - physics

what is the principle of conservation of energy?

energy cannot be created or destroyed, only transferred.

what are the eight energy stores?

kinetic, thermal, chemical, gravitational potential, elastic potential, electrostatic, magnetic and nuclear.

what is the kinetic energy store?

the energy store of a moving object.

what is the thermal energy store?

all objects have one; hotter objects have more thermal energy.

what is the chemical energy store?

energy stored in substances that can release energy through chemical reactions.

what is the gravitational potential energy store?

energy stored by an object raised above ground level.

what is the elastic potential energy store?

energy stored when an object is stretched or compressed.

when does an object have energy in its nuclear store?

energy is stored in the nucleus of its atoms.

what are the four energy transfer pathways?

mechanically, electrically, by heating and by radiation.

what is energy transfer mechanically?

when a force does work on an object.

what is energy transfer electrically?

when a moving charge does work, such as in a light bulb.

what is energy transfer by heating?

energy transfers from a hotter object to a colder object.

what is energy transfer by radiation?

energy transfers by waves, such as light from the sun

what is a system in physics?

a single object or a group of objects being studied.

what is a closed system?

a system where neither matter nor energy enters or leaves.

What happens to total energy in a closed system?

it stays constant; there is no net change in total energy.

what does dissipated energy mean?

energy transferred to less useful stores, often heating the surroundings.

what happens to energy when a ball falls?

energy transfers from its gravitational potential store to its kinetic store.

what happens to energy when a car slows down?

energy transfers from kinetic stores to thermal stores of the brakes, wheels and surroundings.