A) Build set up C with a meter stick, strings and ping pong balls. Use tape to attach a piece of thread to each of 2 ping pong balls and suspend them as shown in C.

Use a straw to blow between the 2 balls and note the movement of each. On figure C indicate the new positions of the balls and regions of the lower pressure.
On the same diagram indicate where one must blow so the ping pong balls move in opposite directions. Try it and describe:
____________________________

B) Fold a sheet of notebook paper in half lengthwise and then fold down the ends as shown in figure D to make a paper bridge. What do you happen if you place the " bridge" on your desk top and then under it  ? predict : ____________________________________________________________
Try it and indicate on the diagram the regions of higher and lower pressure and indicate with an arrow the net force on the bridge.
_______________________________________________________________________________________________

PART II: MEASURING PRESSURE WITH A STRAW MANOMETER

PROCEDURE
you need: straw, beaker, glass tube
Prepare the below set up:
Will the level of water in the straw illustrated in figure E change if you blow across its tip?
 predict ______________________________________________

Try it. Was your prediction correct ? On the diagram E indicate where the regions of lower and higher pressure must be to cause this result.
Squeeze the tip of the horizontal straw and try it again. Is the result more pronounced ? Why or why not ?
You are observing a drop in pressure.

Using a straw cut into 2 pieces , build the set up F. You can make your own atomizer and understand how it works.

ANALYSIS

1)EXPLAIN how Bernouill's principle explain the experiments,

2) using Bernouilli's principle explain " Curve balls "

Baseball pitcher employ Bernouilli's principle when throwing a curve ball, and tennis player use it when giving the ball a top spin so it drops rapidly on the
other side of the net. Explain using the diagram below. You may use references.
source: http://www.boscobel.k12.wi.us/~schnrich/bernoulli_effedt.htm

© haplosciences 2000-2009
vente par correspondence jeux éducatifs,  jeux scientifiques clement o ni , jeux educatifs
Amina, Wanikou, mael r oi du mail , laboratoire chimie, fiches e xperiences,  thomas au temps des chevaliers, Pilou  la classe,
 fichiers animation les francas, jeux engrenages singes, engre nages juniors, engr e nages train safari, prismes
microscopes, p rismes, jeux gyzmo sous la mer, jeux engrenages, c o loriage, travaux manuels, animaux, sciences, vente prismes
tub es a essai, apprendre l a nglais , coloriae , anglais maternelle, jeux clémentoni, cahiers maternelle, anglais enfants, anglais petits