Conservation of Energy

Question 1

Types of Energy Stores

Answer 1

Magnetic
Thermal
Chemical
Kinetic
Electrostatic
Elastic Potential
Gravitational Potential
Nuclear

Question 2

Energy Transfers

Answer 2

Energy can be transferred from one store to another - as one store empties, another store fills. The process in which this happens is called Pathways.

There are four main pathways:

Mechanical work - a force moving an object through a distance.

Electrical work - charges moving due to a potential difference.

Heating - due to temperature difference caused electrically or by a chemical reaction.

Radiation - energy transferred by a wave eg by light.

Question 3

Conservation of Energy:

Answer 3

Energy cannot be destroyed or created. Instead, energy can be transferred usefully, stored or dissipated (spread out/ wasted energy.)

Question 4

Gravitational Potential Energy

Answer 4

Energy stored by an object lifted up against the force of gravity.

GPE = change in vertical height x mass x gfs

Question 5

Kinetic Energy

Answer 5

Energy in which an object possesses by being in motion.

KE = 1/2 x mass x velocity(squared)

Question 6

Effiecency

Answer 6

Efficiency = (input energy / total energy) x 100