Tara Flashcards
ENERGY
What is Energy?
Energy is the ‘ability to do work’ or ‘ability to make something happen’
What are the 2 main types of Energy?
Kinetic Energy
Potential Energy
What is Potential Energy?
Is the energy that is stored in objects and is waiting to be used
What are the 4 forms of potential energy?
Elastic potential energy
Gravitational potential energy
Chemical potential energy
Nuclear energy
Elastic potential energy
energy stored through stretching or squashing
example- in a stretched spring or rubber band
Gravitational potential energy
Energy stored due to the height of an object
example- a child at the top of a slide
Chemical potential energy
Energy stored in chemicals
example- how it reacts with acid
Nuclear energy
Energy stored in the nucleus of an atom and released in nuclear reactors or explosions of nuclear weapons; much, much larger than the chemical energy released in chemical reactions
Energy Transfer
Is the flow of energy from one object to another
the type of energy does not change
Energy transformation
Is the conversion of one type of energy
into another type of energy
(the type of energy does change)
Energy flow diagram
A diagram using arrows that shows the way energy
is passed on or changed into other forms
Different forms of Kinetic Energy
Light E
Heat E
Sound E
Electrical KE
( KE= Kinetic Energy ) ( E= Energy )
Measuring Energy
All energy is measured with the unit of joules (J)
¡With one joule of energy you can lift
a 1 kilogram bag of potatoes about 10 centimetres off the floor.
milijoule (mJ) = 1/1000 joules
kilojoule (kJ) = 1000 joules.
megajoule (MJ) = 1 000 000 joules.
Energy Flow Diagrams
Energy Flow Diagrams use arrows to represent energy transforming from one types to another.
Energy Efficiency
The LAW OF CONSERVATION OF ENERGY states that energy can never be created or destroyed, it can only be converted from one form to another.
This means that Energy might be passed on or wasted but it is never lost
