More energy stores
WHAT IS ENERGY?
Energy is the ability to do work or cause change. It makes things move, heat up, light up, make sound, or change shape.
WHY IS ENERGY IMPORTANT?
Without energy:
Nothing can move.
No light.
No heat.
No sound.
No life.
ENERGY STORES.
There are 8 energy stores:
Chemical.
Kinetic.
Thermal.
Gravitational potential.
Elastic potential.
Magnetic.
Electrostatic.
Nuclear.
ENERGY TRANSFERS.
Energy moves between stores by:
Heating.
Radiation.
Mechanical work.
Electrical work.
LAW OF ENERGY.
Energy cannot be created or destroyed. It can only be transferred or transformed.
UNIT OF ENERGY.
Energy is measured in joules (J).
EXAMPLES.
Eating food → chemical → kinetic.
Falling object → gravitational → kinetic.
Light bulb → electrical → light + thermal.
Stretched rubber band → elastic → kinetic.
WASTED ENERGY.
Some energy spreads out and becomes less useful, but it is not lost.
ENERGY in LIFE.
Plants get energy from the Sun.
Animals get energy from food.
Most energy on Earth originally comes from the Sun.
Fun fact.
If you lift a book and put it on a shelf, the book now has stored energy just because it’s higher up.