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ENERGY - Coggle Diagram
ENERGY
what?
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without energy, living things cannot stay alive and reproduce. we get it from food we eat
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forms
electrical
.
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- Electrical appliances, such as toaster and ovens, convert electrical energy to heat to cook food.
When we switch on light bulbs, electrical energy is converted to light energy for us to see the surroundings.
- Electrical energy is convert to sound energy in speakers so that we can listen to the music that is being played.
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sound
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Tuning forks, human vocal cord or drumskin
When objects vibrate, they move back and forth very quickly to produce sound.
When sound reaches our ears, we can detect it.
potential
chemical
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Chemical potential energy is energy stored in food, fuels or battery.
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- Food such as banana, peanuts, meat and rice
- Fuels such as coal, oil, wood, charcoal and cooking gas
- Battery such as dry cells and car batteries
The chemical potential energy can be released through various processes. The stored energy is then transformed into other forms of energy to do work.
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When we carry out respiration, the chemical potential energy in food is released for us to do work.
- When wood is burnt, the chemical potential energy is released. It changes into heat and light energy.
When we form a closed circuit, the chemical potential energy in dry cells is released. It changes into electrical energy.
gravitational
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On Earth, the gravitational force acts on all objects. Whenever the objects move away from the Earth's surface, they have the energy to fall back to the ground when the gravitational force pulls them downwards. This stored energy is called gravitational potential energy.
Gravitational potential energy is the energy possessed by an obiect due to its position from the ground.
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- At A, the object does not have gravitational potential energy on the ground.
At B, the object possesses gravitational potential energy when it is raised to a height.
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elastic
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Elastic potential energy is energy stored in elastic objects that can be stretched, compressed, twisted or bent.
The energy is stored until the force is removed and the object springs back to its original shape, doing work in the process when the elastic potential energy converts into kinetic energy.
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When the rubber band of a catapult (or a slingshot) is stretched, it has elastic potential energy. This stored energy can then be used to make a rock move in the air (to do work).
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- A twisted rubber band has elastic potential energy before it springs back to its original shape.
- A bent diving board or a bent plastic ruler has elastic potential energy before it springs back to its original shape.
The more the elastic object is compressed or stretched, the greater the amount of elastic potential energy is stored.
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Therefore, it is also referred to as stored energy.
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- When we raise a ball to a height (position), it has potential energy.
- When we turn the key of a toy box (condition), it has potential energy.
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