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# Lab 3 - Experiment 3-6(Bernoullis Principle Objective To...

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Experiment 3-6 (Bernoulli’s Principle) Objective : To demonstrate Bernoulli’s Principle. Results, Explanations, Conclusions : For this experiment we placed two books of the same thickness flat on the table with about six inches between them. We then laid a notebook paper over the books so that it spans the area between them. Then a person blew under the paper and observed the motion of the paper. Then we placed a ping-pong ball inside a funnel with the big end of the funnel pointing upwards. We then blew into the funnel in an effort to blow the ball out of the funnel. Then we repeated this experiment with the funnel pointing downwards. We held the ball up until we began to blow and then we let it go. The pressure exerted by air when it is not in motion is equal to the gravitational pull and thus the paper does not move. The air is moving fastest below the paper when we blew under the paper. When we blew into the funnel, the air is moving fastest in the skinny part of the funnel, which is the part around the ping-pong ball. The paper moved downwards because the air pressure where it was moving was less so the air on top pushed down on the paper. The greater pressure on the top pushed down on the paper. The ping-pong ball doesn’t blow out of the funnel, in either case because the air between the ball and funnel has less pressure so the outside nonmoving air has more pressure and pushes the ball and funnel together. These experiments verify Bernoulli’s Principle because air that is moving has less pressure than that of stationary air. Teaching Applications : -“Shower Curtain Attack”: For this experiment demonstrate to the children what occurs when the shower is turned on and what happens to the motion of the shower curtain. If it is done correctly the children should see that the shower curtain would somewhat attack a person in the shower because as steam rises the air moves up and has less pressure. Since there is less air pressure inside the shower curtain, the outside will push the curtain in. This experiment shows how Bernoulli’s Principle works even with household items. -“Fanning Sheet”: In this experiment demonstrate to the children what will happen when a sheet is placed in front of a fan. If placed right and done correctly, the sheet will be sucked into the fan. This is because the fan has more pressure and thus pushes the sheet into it. This experiment would be a good representation of how different pressures effect object’s actions and movements. Diagram :

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Experiment 3-1 (Contact Force) Objective : To demonstrate contact force. Results, Explanations, Conclusions : For this experiment we had a person stand on the scale and had them note the reading. Then we had them bend down, flexing their knees, and then had them jump off of the scale.
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