energy stores and work done

What is the conservation of energy?

Energy can not be created or destroyed only transferred between different forms or objects

What happens when Energy is transferred to an object?

The energy is stored in one of the objects energy stores

What are the different energy stores and give definition

Thermal/internal – heat energy trapped within an object

Kinetic – movement or motion of an object

Gravitational potential energy – energy that an object possesses because of its position in a gravitational field

Elastic potential energy – energy held in an already stretched spring

Chemical energy – energy held in chemical bonds

Magnetic energy

Electrostatic energy

Nuclear energy – get from breaking atoms apart

Why is energy in each of these stores not fixed ?

Bc energy is transferred

What ways can energy be transferred

Mechanically – by a force doing work

Electrically – work done by a moving charges

By heating

By radiation – by light or sound waves

What is a system

Collection of matter or a group of objects/single objects

What happens when a system changes

Energy is transferred either between objects or between different forms (different types of energy stores

What happens in an open system

The matter of the system can exchange Energy from the Outside world (outside system)

Why can an open system lose or gain energy

as it interact with the outside world

What happens in a closed syst m

a closed system is separate from the outside world so neither matter or Energy can enter or leave

Why is the overall charge always zero in a closed system

Even The energy can be transferred within the system. It cannot transfer energy using outside the world.

Give example where energy is transferred through heating kettle

Electrical energy from plug socket flows to heating element of the kettle where it’s transferred electrically to the thermal energy store of the kettle heating element which means that the flow electricity warms the metal heating element the heating element then transfers energy over to the water’s thermal energy store

What is another way of saying energy transferred

Work done

What are the types of work done

Mechanical and electrical

what is mechanical work done what does it involve give example kicking a ball

Mechanical work done involves using force to move an object an example is picking a ball chemical energy store of leg being transferred to kinetic energy store of the ball

What does electrical work done involve what happens

Electrical work done is done when current flows. – Energy required to overcome the resistance in the wires