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Rubbed amber
will attract small objects. This could not
be explained in 6th century B.C.
We now know this has to do with electron
transfer.
Practical
Investigation.
Some
materials get charged by friction more easily than
others. Design
an experiment to find out which materials charge
better than others. Electrical
insulators work better than conductors.
There are now a huge number of different types
of plastic. Most
people would find it hard to give the scientific name
for each material.
If you get stuck, you can give the name of the
object, for example.
1,
Old vinyl record.
2,
Expanded polystyrene packaging.
3,
Old CD.
4,
Clear plastic ruler. etc.
You
will need to find a way of comparing the amount of
charge on the different objects.
This
link may be useful. Click
here.
Presentation
Prepare a presentation to the class, which
explains the physics behind what
you have found out.
How
do charged objects attract others? Try to make your
presentation interesting by including a demonstration.
For example,
if
a plastic ruler is rubbed with a dry cloth, it will
bend a thin stream of water.
You may wish to demonstrate and explain this
effect.
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