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8 Physics, Screenshot 2024-06-17 at 18.07.37 - Coggle Diagram
8 Physics
Energy
The unit of energy is the joule (J), kilojoules (kJ). 1 kJ = 1000 J.
our body use energy in: body warm, breathing, moving, and
talking......
Energy is not ‘transformed’ from one type to another. Energy is a quantity, so is transferred from one store to another.
Energy is transferred by heating, anelectric current, forces, and radiation including light and sound.
Energy from the sun
radiation
The Sun is a nuclear store of energy. Hydrogen atoms combine to form helium, and energy is released.
There are different energy stores including chemical, gravitational potential, elastic, kinetic, thermal, and nuclear.
dissipated energy
the energy that is wasted, usually transfered to the surroundings example:light bulb->light,wasted:heat energy
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Kinetic energy
Kinetic energy is the energy that something has when it is moving. It is
another term for ‘energy in a kinetic store’, or ‘energy stored kinetically
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sound
things vibrate to produce sound. Sound transfers energy from a source such as a drum to a detector such as your ear.
Sound waves need a material, or medium, to travel through, such as air, water, or walls.
The vibrating source produces a sound wave that makes the
particles in the medium vibrate backwards and forwards as the wave passes.
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Electricity
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voltage is a measure of the amount of work that a group of electrons will do if allowed. to flow in an electric circuit, a mesure of how motivated the elecrically charged particles are to get out and do something
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