Physics - conservation of energy

4 energy transfers

Heat, sound, light, electric current

4 energy stores

Kinetic (thermal), chemical, potential (gravitational, potential,elastic, magnetic), nuclear

What is energy measured in?

Joules (J)

What is energy?

The ability or potential to do some type of work.

What two energy stores and transfers occur when something drops to the floor.

• At the top: gravitational potential energy

• On the way down: kinetic en energy increasing and GPE decreasing

• On impact: sound energy and heat energy. Kinetic energy and GPE now zero.

Conservation of energy

Energy cannot be created or destroyed, only transferred

How to increase kinetic energy of an object

Objects needs to be given more velocity/ speed

How to increase gravitation potential energy of an object?

Object needs to be given more height

Kinetic energy

Anything with motion/ speed/ velocity

Electric energy

The flow of electrons through a conductor

Potential energy

A change in height or stretching/ squashing a material

Thermal (heat) energy

A temperature difference between two points

Chemical energy

The bond between atoms (ionic/ covalent)

Sound energy

Movement/ oscillation of particles

Nuclear energy

Bonds inside the atom (between protons and neutrons)

Light energy

Electromagnetic waves

Kids Hate Learning GCSE Energy Names

• Kinetic

• Heat

• Light

• Gravitational potential

• Chemical

• Sound

• Elastic potential

• Electrical

• Nuclear

Closed systems

Closed systems are systems where neither matter nor energy can enter or leave

Useful energy

Energy that contributes to making a device or object do what it was created or designed to perform

Wasted energy

Energy that is not useful.

What is force measured in?

Newtons

In an energy flow diagram what does the circle represent?

The device

In an energy flow diagram what does the square represent?

The store

In an energy flow diagram what does the arrow represent?

The energy transfer

What is gravitational field strength measured in?

Newtons per kilogram (N/kg)

Dissipation

When something concentrated spreads apart to become something that is no longer usable useful