Static Electricity Flashcards

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1
Q

What is static all about?

A

Charges that are not free to move

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2
Q

Where are charges often not free to move?

A

In insulators

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3
Q

Wheh charges are not free to move, what does this cause?

(2)

A

The charges to build up in one place and often end up with a spark or shock when they finally do move.

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4
Q

What causes the build up of static?

A

The friction between certain insulating materials

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5
Q

What happens when certain insulating materials are rubbed together?

A

Negatively charged electrons are scraped off one material and moved onto another

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6
Q

If electrons are moved from one material onto another, what will this do to the insulators?

A

Leave the one that has lost electrons with a positive charge, and that one that has gained electrons with a negative charge

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7
Q

Which way the electrons are transferred depends on what?

A

The two materials involved

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8
Q

What do electrically charged objects do to small objects placed near them?

A

They attract them

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9
Q

When a polythene rod is rubbed with a cloth duster, which way do the electrons move?

A

From the duster onto the polythene rod

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10
Q

When an acetate rod is rubbed with a duster cloth, which way do the electrons move?

A

From the acetate rod onto the duster

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11
Q

Static electricity is caused by ____ being ____

A

Static electricity is caused by electrons being transferred

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12
Q

How does static electricity relate to your hair?

A

Static builds up in your hair, so that the strands repel each other

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13
Q

Both ____ and ____ charges are only ever produced by the movement of ____

A

Both positive and negative charges are only ever produced by the movement of electrons

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14
Q

Positive charges…

A

…definitely DO NOT MOVE

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15
Q

What is a positive static charge always caused by?

A

Electrons moving away elsewhere

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16
Q

The material that loses the electrons loses some ____ ____, and is left with an ____ ____ ____.

A

The material that loses the electrons loses some negative charge, and is left with an equal positive charge.

17
Q

When two electrically charged objects are brought close, what happens?

A

They exert a force on one another

18
Q

Two things with opposite charges will…

A

attract each other

19
Q

Two things with the same electric charge will…

A

repel each other

20
Q

As the two charged objects become further apart, the forces between them get ___

A

Weaker

21
Q

Electrical charges can move easily through which kind of materials?

A

Conductors

22
Q

Name a material known to be a good conductor

A

Metals

23
Q

Remember, opposites…

A

OPPOSITES ATTRACT