Energy Flashcards
What are the 9 types of energy?
Kinetic Energy (KE)
Gravitational Potential Energy (GPE)
Elastic Potential Energy (Elastic PE)
Chemical Energy
Electrical Energy
Nuclear Energy
Light Energy
Sound Energy
Heat Energy
What is Kinetic energy?
Energy in a moving object,
eg. A moving car
What is GPE?
Energy due to the height of an object,
eg. A skier on a slope
What is Elastic PE?
Energy in a stretched or compressed object,
eg. a spring
What is Chemical energy?
Energy contained in food or fuel,
eg. Food and petrol
What is Electrical Energy?
Energy in the flow of electrons
Eg: A battery
What is Nuclear Energy?
Energy released when the nucleus of an atom slips
What is Light energy?
Energy given out by any hot object
Eg: The sun, light bulb
What is sound energy?
Energy given out by any vibrating objects,
Eg: A loud speaker
What is heat energy?
Energy contained in any hot or warm object,
Eg: Burning coal
What is Potential Energy?
Is energy due to the height
What is PE formula?
Mass (kg) x gravity (10m/s) x height (m)
M x g x h
What happens to PE when an object falls?
Its converted into Kinetic Energy
Kinetic energy gained = potential energy lost
What is Kinetic Energy?
Kinetic energy is the energy of movement.
Anything moving has kinetic energy
What is the formula for kinetic energy?
Kinetic energy (KE) = 1⁄2 x mass x velocity2
What is the unit of mass?
Kg
What is the unit of velocity?
m/s
What is the formula for velocity?
2KE
V= √.———
m
What is the formula for mass ?
2KE
m= ————
V²
In a circuit where is energy supplied from?
Energy is transferred from cells and other sources
Eg: batteries
If there are no resistive forces in a circuit what happens to the energy?
When there are no resistive forces, total energy remains constant.
What is the energy rule ?
Energy cannot be created or destroyed, but only changed from one form into another.
How is energy usually lost?
Usually, some energy is used up doing work against friction and air resistance → lost as heat.
