This video accompanies the lesson on pressure. There are several parts to this demo:
1. Each of three pins removed when the cap is not on the bottle.
2. Bottom pin removed when cap is on the bottle.
3. #2 continued when top pin is removed.
With the cap off, water is able to leak out through all three openings because pressure is being put on the bottle through the top (where the cap is missing). When the cap is put on and one pin is taken out, the pressure cannot go through the top of the bottle and isn't putting force on the water (the pressure inside and out of the bottle is the same). When a second pin is taken out, there are two available spots for pressure on the water (the pressure inside and out is no longer the same) and one hole starts to leak.
Materials: one water bottle filled to the top with water containing a blue pin at the top, red pin in the center, and a green pin at the bottom. In this demo she takes the top off of the bottle. She first takes out the blue pin and only a little water comes out, and then puts the pin back. Then she takes out the red pin and more water comes out, then she puts the pin back. Lastly she takes out the green pin and more water shot out, then she returned the pin back. Next, she puts the top to the water bottle back on. Then she takes out the green pin again and we see that only a little bit of water comes out, and then stops. Keeping the green pin out, she pulls out the blue pin and water starts to come out again out of the green pin hole. This shows that the pressure builds up, the farther you go down the bottle, which is why the blue only lost a little water, and the green lost much more. The pressure builds up and causes the water to pour out faster. With the top on, the pressure is pushing on the cap as apposed to directly pushing the water, which is why barely any water came out with the cap on. Taking out the blue pin made the water bottle have two openings in which pressure pushed down on one and water poured out the other, which is why the water poured out faster when we took out the blue pin.
Materials used in this demonstration were a water bottle filled with water, and three pins. One pin (blue) was towards the top of the water bottle, the second pin (red) was in the middle of the water bottle, and the third pin (green) was towards the bottom of the water bottle. At first, the water bottle did not have the cap on it. First, Ms. Wenk pulled out the blue pin that was near the top of the water bottle. When she pulled it out, a little water dripped down. When Ms. Wenk took out the red pin that was in the center of the water bottle, more water came out of the bottle, looking like a mini fountain. Then, Ms. Wenk took out the third pin that was near the bottom of the bottle and again it looked like a mini fountain with water lightly shooting out of the bottle. Ms. Wenk put the cap on the water bottle and tried pulling out the last pin again. The water started coming out again like it did without the cap on, but then quickly stopped coming out. Without putting the green pin back in, Ms. Wenk took out the blue pin and water started coming out like a fountain but this time towards the bottom of the bottle where the green pin hole was located. This demonstration showed that there was more pressure towards the bottom of the bottle since the hole where the green pin was, lost the most water.
The materials used in this demonstrating were a full water bottle with three pins of various colors. The pins were then arranged in a straight line of various heights, and punctured in the water bottle. The blue one at the top, red in the middle and green at the bottom. For the first part there was no cap on the water bottle. When Mrs.Wenk took out the blue pin, there was a steady trickle of water going down the water bottle. When the blue pin was replaced and the red was taken out, the water shot out in an arch and was consistent in that. After replacing that pin and taking out the green pin, the one at the bottom, we see that the same thing occured as with the red one however the stream did not reach as far. This time however Mrs.Wenk repeated everything but replaced the cap on top of the bottle. This time the green pin, the one at the bottom was taken out, and what happened shocked me, the stream came again, but quickly receded and then stopped all together. The wonder continued when Mrs.Wenk pulled out the top pin, the blue one,without replacing the green and water started shooting out, not from the hole where the blue pin was but where the green one was. This happens because there is more pressure towards the bottom of the bottle. This is proven by the fact that the hole with the green pin lost the most water.
Materials used: water bottle, water, 3 pins
ReplyDeleteWith the cap off, water is able to leak out through all three openings because pressure is being put on the bottle through the top (where the cap is missing). When the cap is put on and one pin is taken out, the pressure cannot go through the top of the bottle and isn't putting force on the water (the pressure inside and out of the bottle is the same). When a second pin is taken out, there are two available spots for pressure on the water (the pressure inside and out is no longer the same) and one hole starts to leak.
When the cap is off, how does the water from each of the 3 holes compare?
DeleteMaterials: one water bottle filled to the top with water containing a blue pin at the top, red pin in the center, and a green pin at the bottom.
ReplyDeleteIn this demo she takes the top off of the bottle. She first takes out the blue pin and only a little water comes out, and then puts the pin back. Then she takes out the red pin and more water comes out, then she puts the pin back. Lastly she takes out the green pin and more water shot out, then she returned the pin back. Next, she puts the top to the water bottle back on. Then she takes out the green pin again and we see that only a little bit of water comes out, and then stops. Keeping the green pin out, she pulls out the blue pin and water starts to come out again out of the green pin hole. This shows that the pressure builds up, the farther you go down the bottle, which is why the blue only lost a little water, and the green lost much more. The pressure builds up and causes the water to pour out faster. With the top on, the pressure is pushing on the cap as apposed to directly pushing the water, which is why barely any water came out with the cap on. Taking out the blue pin made the water bottle have two openings in which pressure pushed down on one and water poured out the other, which is why the water poured out faster when we took out the blue pin.
Materials used in this demonstration were a water bottle filled with water, and three pins. One pin (blue) was towards the top of the water bottle, the second pin (red) was in the middle of the water bottle, and the third pin (green) was towards the bottom of the water bottle. At first, the water bottle did not have the cap on it. First, Ms. Wenk pulled out the blue pin that was near the top of the water bottle. When she pulled it out, a little water dripped down. When Ms. Wenk took out the red pin that was in the center of the water bottle, more water came out of the bottle, looking like a mini fountain. Then, Ms. Wenk took out the third pin that was near the bottom of the bottle and again it looked like a mini fountain with water lightly shooting out of the bottle. Ms. Wenk put the cap on the water bottle and tried pulling out the last pin again. The water started coming out again like it did without the cap on, but then quickly stopped coming out. Without putting the green pin back in, Ms. Wenk took out the blue pin and water started coming out like a fountain but this time towards the bottom of the bottle where the green pin hole was located. This demonstration showed that there was more pressure towards the bottom of the bottle since the hole where the green pin was, lost the most water.
ReplyDeleteThe materials used in this demonstrating were a full water bottle with three pins of various colors. The pins were then arranged in a straight line of various heights, and punctured in the water bottle. The blue one at the top, red in the middle and green at the bottom. For the first part there was no cap on the water bottle. When Mrs.Wenk took out the blue pin, there was a steady trickle of water going down the water bottle. When the blue pin was replaced and the red was taken out, the water shot out in an arch and was consistent in that. After replacing that pin and taking out the green pin, the one at the bottom, we see that the same thing occured as with the red one however the stream did not reach as far. This time however Mrs.Wenk repeated everything but replaced the cap on top of the bottle. This time the green pin, the one at the bottom was taken out, and what happened shocked me, the stream came again, but quickly receded and then stopped all together. The wonder continued when Mrs.Wenk pulled out the top pin, the blue one,without replacing the green and water started shooting out, not from the hole where the blue pin was but where the green one was. This happens because there is more pressure towards the bottom of the bottle. This is proven by the fact that the hole with the green pin lost the most water.
ReplyDeleteHow do you explain what happened when the cap was on? Think about what is exerting pressure on the pin opening in the bottle.
Delete