i want to make this for a physics project for school. i found a video on how to make it, but i dont understand the physics behind. i have to make a model and a poster explaining the physics. i dont understand what to put on the poster so could someone help me with which physics principles this project would go with?
It isn't practical to give a detailed description here. This is a positive displacement pump. The pump chamber is sealed so that as the piston is moved up the volume within the chamber increases. Water is pushed into this chamber by the outside air pressure. If the pump is located too far above the water source then the air pressure is not sufficient and you will produce a vacuum inside but the water still will not flow. When the pump is pushed down the water flows out. Now the one way valves are critical. We don't want the water to flow back the way it came and we don't want the water that we have already pumped to flow back into the pump. So a one way valve on the inlet will permit water to flow into the pump but not out of it. And a one way valve on the outlet will permit water to flow OUT of the pump but not into it. So with each stroke you a) reduce the pressure in the pump. b) water is forced from the inlet, past its one way valve and then into the pump. c) the pump is pushed down increasing the pressure in the pump. d) water flows out of the pump through the other one way valve and on to the output.
