Licenca
To delo je na voljo pod pogoji slovenske licence Creative Commons 2.5:

priznanje avtorstva - nekomercialno - deljenje pod enakimi pogoji.

Celotna licenca je na voljo na spletu na naslovu http://creativecommons.org/licenses/by-nc-sa/2.5/si/. V skladu s to licenco je dovoljeno vsakemu uporabniku delo razmnoževati, distribuirati, javno priobčevati, dajati v najem in tudi predelovati, vendar samo v nekomercialne namene in ob pogoju, da navede avtorja oziroma avtorje in izdajatelja tega dela. Če uporabnik delo predela, kar pomeni, da ga spremeni, preoblikuje, prevede ali uporabi to delo v svojem delu, lahko predelavo dela ponudi na voljo le pod pogoji, ki so enaki pogojem iz te licence oziroma pod enako licenco.
Navodila

Read the instructions about a simple experiment you can try at school or at home. Prevod

Sir Isaac Newton was one of the most important scientists of all time. 400 hundred years ago he used maths to find laws of motion that are still used today. In this experiment you can demonstrate Newton’s 3rd law of motion which is that ‘every action has an equal and opposite reaction’ by showing that a soda pop can hung from a string spins by the force created when water runs out of holes near to the bottom of the can.

 

You need these things:

• An empty 330ml aluminium pop can with the ring-pull still attached
• A nail to make the holes in the can
• A piece of fishing line and scissors to cut it
• A bucket of water
• Something to mop up the water if it spills!

 

You need to do these things next:

Lay the can on its side and use the nail to make 1 hole near the base of the can. Push the nail to one side to bend the metal so the hole slants. Rotate the can about 90 degrees and repeat this 3 more times so you have four equally spaced holes around the base of the can. All the holes should slant in the same direction (this is really important)

Now tie a piece of fishing line about 50cms long to the ring pull so that the can hangs down free and you are ready to go.

A pop can is just a fizzy soda can for instance coca- cola sprite etc you do have them in Slovenia. Not a beer can because they are too large for this experiment it needs to be a 330ml aluminium can, not a tin food can because that wouldn't have a top on it or the ring pull opener in the lid.

The experiment

  • Put the empty can into the bucket of water until it fills up.
  • Hold the can above the bucket of water so that the fishing line is free to move.

 


You can now answer these questions

 

  • Why did the can begin spinning when the water ran out of the holes?
  • What was the action?
  • What was the reaction?

If you have more cans you can try the experiment with more holes or different sized holes. If you also mark the cans with a piece of tape or a waterproof marker pen you can count the number of times each of the cans spins to see if the changes make any difference.

You have demonstrated Newton’s 3rd Law of motion. Well done!

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