Topic 2 Static Electricty Flashcards

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1
Q

Why’d shocks and sparks happen

A

Static electricity are charges not free to move causing them to build up in one place until they finally move

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2
Q

What happens when certain insulating materials are rubbed together

A

Negatively charged electrons are scrapped off one and dumped onto the other

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3
Q

What does this friction leave the materials with

A

A positive static charge on one and a negative static charge on the other

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4
Q

Shat does the way the electrons are transferred rely on

A

The two materials involved

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5
Q

Examples of static caused by friction

A

Polythene negative when rubbed
Acetate positive when rubbed

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6
Q

How are ions created

A

Loss or gain of electrons

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7
Q

Why does a material have a positive charge

A

Electrons are lost which means it loses some negative charge and is left with an equal positive charge

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8
Q

Why do we get shocked/ sparked

A

As electric charge builds on an object the pd between object and earth (0v) increases
When pd gets large enough electrons can jump across the gap between the charged object and the earth causing spark
Can also jump to earth conductor which is why we get static shocks
Usually happens when small

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9
Q

What happens when two electrically charged forces are brought close together

A

They exert a force on one another

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10
Q

Rules for attraction

A

Opposites attract
Two of the same repel

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11
Q

What happens when the things get further apart

A

The forces get weaker

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12
Q

What is it called when these forces cause an object to move

A

Electrostatic attraction / repulsion

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13
Q

What is electrostatic attraction / repulsion

A

A non contact force

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14
Q

Way to see electrostatic force

A

Suspend rod with known charge from piece of string place object with same charge nearby and will repel and move away

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