static electricity (topic 2) Flashcards

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1
Q

(4)

A
  • friction (between cloth and rod) causes
  • electrons (to) move
  • from the acetate rod to the cloth
  • (net) charge on cloth is now negative
  • (net) charge on rod is now positive
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2
Q
A
  • there is a force of attraction between the acetate rod and the cloth
  • unlike charges attract
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3
Q
A
  • (bottom ends) move apart or repel
  • have same charge (both have negative charge)
  • same or like charges repel
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4
Q
A

positive
electrons
cloth
strips

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5
Q
A
  • becomes (electrically) charged or
  • comb attracts paper
  • charge gone to Earth (body)
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6
Q
A
  • copper
  • it is an (electrical) conductor
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7
Q
A
  • refuelling an aircraft
  • a spark may cause an explosion / fire / ignite the fuel
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8
Q
A
  • (forces are) equal
  • (forces act in) opposite directions
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9
Q

(2)

A
  • friction (between fleece and shirt)
  • (causing) electrons to transfer from one to the other
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10
Q

(2)

A
  • transfer of electrons
  • from cloth to the rod
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11
Q

explain why when the negatively charged rod is placed near a thin stream of water, it causes the stream of water to deflect (2)

A
  • the negatively charged electrons in the stream of water are repelled by the negatively charged electrons in the rod
  • causing the water to experience a force deflecting it
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12
Q

the student accidentally puts the negatively charged rod in the stream of water, explain why the stream of water does not deflect as far as before (3)

A
  • the rod has lost some of it’s charge
  • electrons have been transferred
  • from the rod to the water
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13
Q

one of the negatively charged balloons is now placed carefully on a vertical wall, explain why the balloon does not fall to the ground (3)

A
  • the negative charge of the balloon repels the electrons in the surface of the wall
  • electrons in the surface of the wall are repelled deeper into the wall, leaving the surface with a net positive charge
  • the negative charge of the balloon is attracted to the positive charge in the surface of the wall
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14
Q

as aircraft fly through the air, they become statically charged, explain how an aircraft could become charged during flight (2)

A
  • as the aircraft flies through the air, it rubs against the air
  • electrons are transferred leaving the aircraft electrically charged
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15
Q

describe why it is dangerous to refuel a statically charged aircraft (2)

A
  • the aircraft could cause a spark
  • igniting the aviation fuel
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16
Q

before aircraft are refuelled, they are connected to Earth by an electrical cable, explain why this makes refuelling safe (2)

A
  • the earthing cable discharges any static charge that built up during the flight
  • this prevents any sparks discharging from the aircraft, which could ignite the fue
17
Q
A
18
Q

(3)

A
  • the negative charge of the comb repels the electrons in the paper
  • electrons in the paper move further away from the surface, leaving a positive charge at the surface of the paper
  • the positive charge at the surface of the paper is strongly attracted to the negative charge of the comb
  • pieces of paper experience a force due to the attraction and jump up to stick to the comb
19
Q

the student rubs a metal rod with a cloth and brings it close to the pieces of paper, explain what happens to the pieces of paper (2)

A
20
Q

(3)

A
  • the belt rubs against the comb
  • causing electrons to be transferred
  • from the dome to the belt
21
Q

before the teacher turned on the Van de Graaff generator, he placed a pile of metal cake cases on top, the cake cases also became positively charged, explain the cake cases need to be made from metal (2)

A
  • metal is a good conductor of electricity
  • this allows charge to build up on the cake cases
22
Q

the teacher turns on the Van de Graaff generator, explain why the metal cake cases begin to fly off after a short period

A
  • (as the belt spins,) electrons are removed from the metal dome leaving the dome positively charged
  • the metal cases are in contact with the metal dome and also become positively charged
  • the cake cases repel each other and the Van de Graaff generator due to having the same charge
  • the cases experience a force due to the electrostatic repulsion, causing them to fly off
23
Q

when the ball touches the negatively charged metal plate it becomes charged, explain why (2)

A
  • electrons are transferred
  • from the plate to the ball
24
Q

the ball now swings rapidly across towards the positively charged plate after touching the negatively charged metal plate, explain why (2)

A
  • the ball and the metal plate both have a negative charge
  • the negatively charged plate repels the ball across to the positively charged plate
  • the positively charged plate attracts the negatively charged ball
25
Q

(1)

A

the ball oscillated between the plates 4 times per second

26
Q
A
27
Q

(3)

A
  • as the paint leaves the spray gun it is negatively charged
  • the negatively charged paint droplets repel
  • spreading out to form a fine mist
28
Q

explain why is the car positively charged (2)

A
29
Q

(2)

A
  • electrons are transferred
  • from the slide to the child
30
Q

explain why the childs hair is standing on end (3)

A
  • each hair strand is negatively charged
  • like charges repel
  • hair feels repulsive force causing it to spread out
31
Q

the child gets off the slide and touches the metal frame of the slide, explain what happens to the negatively charged childs hair (2)

A