Energy Flashcards
Kinetic energy equation
Ek= 1/2 x mass x velocity2
Gravitation potential energy equation
Ep= mass x gravitational field strength x height
Elastic potential energy equation
Ee= 1/2 x spring constant x extension2
Specific heat capacity equation
E= mass x specific heat capacity x change in tempertaure
Power equation energy
P = Energy/Time
Work done equation
W= Power x time
Stretching an object will give it _______ energy
Elastical potential
As an object falls it loses Ep energy and gains
Kinetic energy
Heating a material…
Transfers the energy to its thermal energy store heating the object up
Specific heat capacity definition
The amount of energy needed to increase an objects temperature by 1 degree
Name every energy store and where they are found
Kinetic- moving objects have kinetic energy
Thermal- all objects have thermal energy, objects at a higher temperature have more
Chemical- Anything that can release energy during a chemical reaction
Elastical potential- Objects that are stretched
Gravitational potential- Anything that is raised
Electrostatic- Charges that attract or repel
Magnetic- Magnets that attract or repel
Nuclear- The nucleus of an atom releases energy
Name the 3 ways energy can be transferred (not kinetic)
Mechanically- when work is done
Electrical- When moving charge does work
Heating- When energy is transferred from a hotter to colder object
What is the conservation of energy
Energy cannot be created or destroyed only transferred from one form to another.
Definition of power
Work done in a given amount of time
Why are lubricants used
When an object moves there are friction forces acting which loses energy to surroundings. Lubricants reduce the friction between surfaces
Definition of conduction
When a solid is heated the particles vibrate and collide and the energy is transferred
Definition of convection/ convection current
When a liquid or gas is heated the particles move faster this means the liquid or gas becomes less dense. The denser region will rise above the cooler region.
Definition of insulation
Reduces the amount of heat loss
How to reduce heat loss in home
Thick walls
Loft insulation
Cavity wall insulation
Double glazed window insulation
Efficiency equations
Efficiency = (useful output energy/ total input energy) x 100 Efficiency = (useful power output/ total power input) x 100
Non-renewable energy definition and example
Coal, oil, natural gas they are finite and damage the environment
Renewable energy definition
Energy resources that will never run out
