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14 Cards in this Set
- Front
- Back
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When you increase density, what happens to pressure?
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Increase density = Increase pressure
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When you descrease density, what happens to pressure?
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Decrease density = decrease pressure
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If you increase space, what happens to density?
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Increase space = decrease density (more space means you aren't so squeezed - that's why it is less dense)
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If you decrease space, what happens to density?
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Decrease space = increase density (if you have less space, you are getting more squeezed and so therefore it is more dense)
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Pressure will always move from ___________ (high or low?) pressure to ______________ (high or low?) pressure.
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HIGH pressure always moves towards LOW pressure
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Why does a cartesian diver sink when you squeeze the side of the bottle?
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1. When you squeeze the bottle, you decrease the space for the water.
2. The water pushes up into the air bubble, squeezing the air bubble. 3. This increases the density of the air bubble ... causing it to sink in water. Lesson learned: Increase pressure = increase density |
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When you heat an open container (like the soda can), all that hot air leaves the container. Inside the container is now ____________ (high or low?) density and therefore also ___________ (high or low?) pressure.
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LOW density and LOW pressure
Lesson learned: When you heat an open container, the hot air escapes leaving an area of LOW pressure. |
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What do you think would happen if you heated a closed container? Explain why.
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It would EXPLODE!!!!! Think about it. The molecules get heated, they move around faster and faster making an area of HIGH pressure. If the air can't escape, that high pressure will build until the container EXPLODES!
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Why does the card stick on the bottom of an upside down glass of water?
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When you turn over the cup, some water leaks out. This gives the air at the top of the cup MORE space. MORE space = LESS density and LESS density = LESS pressure. If there is less pressure inside, then the air outside is higher pressure. It pushes in on the cup and card from all directions trying to get in.... so the card is stuck on the cup.
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Which two experiments both showed that when you give air more space, you create an area of lower pressure?
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The cup and the card AND the cup and the balloon tricks.
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Think of the "Three candles in a Jar" experiment. Look up how it works. Using the same ideas, can you explain how a straw works?
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1. You suck on the straw taking out the air inside the straw.
2. This creates an area of LOW pressure. 3. The outside air is HIGHER pressure. 4. High pressure tries to move to low pressure SO the outside air pushes on the water and the water moves up into the straw. That's why it's hard to suck a straw at first - but then it's really easy to drink. You have to suck out the air first but then the outside air does the work for you! Cool, huh? |
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If pressure is equal, water will always stay _________.
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Flat.
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How does the egg end up in the flask after the air in the flask is heated?
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1. The air is heated and escapes out the top (that is why the egg jumps a little at the beginning - the hot air is escaping).
2. Once the air has left the flask, inside the flask is now LOW pressure. 3. Outside is HIGH pressure. The outside air pushes to get in. 4. ....and so the egg gets pushed in with in. |
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If you have a hole near the top of your bottle, the water dribbles out. BUT if you have a hole near the bottom, the water shoots out pretty far. WHY?
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The weight of the water creates a lot of pressure. On the bottom of the bottle, there is a lot of water on top so there is HIGH pressure. At the top of the bottle, there is only a little water and so just a little pressure. That's why water dribbles out from a hole at the top but flies out from a hole at the bottom of a bottle of water.
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