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Science EOY (9I (Types of Forces (Upthrust Found in water, Gravity pulls…
Science EOY
9I
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Weight vs Mass
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Your weight changes when you go to a different planet depending on how strong the force of gravity is on that planet
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Floating and sinking
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There is another reason which is if the item is more dense than water it sinks but if it is not it will float
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Unbalanced forces
this is when a force on one side is bigger than the one on the other side causing an unbalanced force
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8E
Engines
An engine is where a car or any other motor powered vehicle gets its power from to make it do anything
Many of the fuels released in engines are harmful for the environment and cause pollution but new cars are being designed to limit the amount of pollution they cause.
Fuels
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for hydrogen to combust with oxygen you need energy from a spark or a flame to start the reaction. After this the energy is then released into the surroundings
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Global Warming
This is when the energy transferred from the sun to the earth gets trapped inside the earths atmosphere by greenhouse gases such as carbon dioxide causing the earth to heat up. This is called the green house effect.
Fire safety
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There are different types of fire extinguishers to put out different kinds fires because if you put water on an oil pan fire it makes the fire spread quicker
Air pollution
when carbon burns in plenty of air, only carbon dioxide is formed. this is called complete combustion because all the carbon reacts as fully as it can with oxygen. However if there is not enough oxygen it becomes incomplete combustion causing there to be a highly toxic gas called carbon Monoxide which pollutes the air.
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