11 CLASS PHYSICS PROJECT

how to make a pump pen.

For making pen pump we need a pen,a refill,a small bearing ball of metal,a straight wire or we can use a cycle spoke,thread and scissor.

First of all we will make a hole in pen with hot pin or scissor near back cap of pen.We take the cycle spoke and tightly wrap the thread on it to make a piston.We drop the ball in the pen. We make a hole in back cap so that the spoke can move freely.Then we insert the soke piston and finally screw the end cap.At last we place the pump in a mug of water and move the cycle spoke up and down .We will see that water will come up with a flow after a few strokes.


NOW WHAT IS THE PRINCIPAL BEHIND THIS .LET SEE ..........

PRINCIPLE

The basic principle behind this project is Bernoulli’s theorem.

WORKING

 It is basically an application of Bernoulli's Principle, which states that as the velocity of flow in a fluid increases, the pressure in that fluid decreases. Bernoulli's principle only applies when no work is done. Bernoulli principle is approximated if a small amount of work is performed.  In the case of the pump, the hole performs a small amount of work on the air, resisting the flow and requiring a higher pressure inside the tube to compensate, but the pressure still drops below ambient as the air accelerates into the hole. In simple language

"The hand pump actually has a chamber in which pressure is created when you do pumping. The water in the ground replaces the pressure and then gets out thru the outlet. Repeated pumping creates pressure high and low. And water comes in and goes out. Hope u understands".

For more help please visit the link pen pum to get more help..

This is a nice project .. it will help you to score better because you are making a nice project without wasting time and money . it will cost you around 10-15 INR.

thankyou bye-bye.........

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