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Posts tagged ‘cars’

Air pressure, water pressure and cars

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      Unfold a sheet of newspaper and put a ruler under it.  Have about 3 inches of the ruler sticking out over the edge of the table.  Hit the end of the ruler.  What happens to the paper? 

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     Now fold up the newspaper and try it again.  Why is there a difference?  The paper is held down by air pressure.  More surface area= more pressure   Who doesn’t love flinging things around.  How small can you make the paper and how far can you get it to fly?

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     Punch 4 holes in the side near the bottom of a can of soda.  I used a nail.  Turn the nail to the side before pulling it out to angle the hole.  Turn the tab up and attach a string.  Fill with water and watch the can spin by the force of the water pressure.  Try making one with more holes.  Is there a difference? How about if you have few holes that are larger?

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Here is the bottom of the same car.

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     These are some examples of cars that we will make.  I will prepunch holes in the wheels.  The axles were straws and pipe cleaners.  Not the best materials.  I think I might look for some sticks to use.  Of course the kids can take time to decorate them and make some passengers for their cars. Once everyone has made a car it is time to test them out on ramps!