static electricity and electric charge

Question 1

what is a conductor

Answer 1

a material which allows charge to flow through it easily

Question 2

conductors are made of

Answer 2

positevely charged ions with delocalised electrons

Question 3

insulators

Answer 3

have no free charges so the electrons can’t move

Question 4

examples of insulators

Answer 4

plastic

rubber

glass

wood

air

Question 5

examples of conductors

Answer 5

copper

aluminium

gold

silver

steel

Question 6

investigating charge by friction

Answer 6

1- take a polythene rod hold it at its centre and rub the ends with cloth

2- suspend it but don’t touch the ends

3- take an acrylic rod and rub with another cloth

4- without touvhing any ends, bring each end of the acrylic rod to the ends of the polythene rod

5- record any motion (attraction or repulsion)

6- repeat with different materials of rod (keep polysterene)

Question 7

when does an object become negatively charged

Answer 7

when it gains electrons

Question 8

when 2 charged particles are together, what happens

Answer 8

they exert a force on each other (attraction or repulsion)

Question 9

what is static electricity

Answer 9

accumulation of charge on an object

Question 10

what happens when insulating materials are rubbed against each other

Answer 10

they become electrically charged, and the charges remain on the insulators and cannot immediately flow away (so one becomes positive and one becomes negative)