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Term 3 Flashcards

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1
Q

What are the different types of forces

A
  • Field forces, no contact

- Contact forces, direct contact

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2
Q

What are different types of contact forces, explain

A
  • pull, a force that is emitted towards an object
  • push, a force emitted away from an object
  • friction, a force experienced when two objects rub against each other in opposite directions
  • compression, the force that makes something expand when it is let go
  • tension, the force that will make something stink when it is let go after being stretched
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3
Q

What are the different types of field forces

A
  • gravity
  • magnet
  • static
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4
Q

What is to definition of torsion

A

When the force of pull and push are emitted at the same time in opposite direction

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5
Q

What is static

A

Static is generated through a contact force ( friction )

And is different from the rest of the field forces

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6
Q

What is the difference between magnetic and magnetized

A

Magnetic, a metal the is drawn to a magnet

Magnetized, is a magnet… it has a north and South Pole

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7
Q

What are the properties of a magnet

A
  • It has a north and South Pole
  • it has magnetic fields that can never cross or touch
  • opposite poles attract
  • similar poles repel
  • the fields join the poles
  • to become magnetized it has to be made from Cobalt and/or Nickel
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8
Q

On a compass what does the red arrow point to and what does the other point to and what are they

A

The red arrow…
…points to the North Pole which is magnetic south charge
…is charged magnetic north

The other arrow…
… points to the South Pole which is magnetically north charged
…is charged magnetic south

Opposites attract

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9
Q

Who came up with the law of gravity and what is it based on

A

Isaac Newton

  1. Directly related to the mass of an object
  2. Directly related to the distance from the centre of an object
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10
Q

What is weight

A

The amount of gravitational force acting on an object, measured in Newtons (N)

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11
Q

What is mass

A

The amount of partials in an object, it is not a force and is measured in kg, g, tons…

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12
Q

How does someone loose weight

A

They have to loose mass to be able to ‘loose’ weight

So mass effects weight

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13
Q

How many Newtons are in one kg

A

9,8N

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14
Q

What is electricity

A

The flow of electrons

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15
Q

In a circuit what is the red and green flow

A

Red is the conventional flow and it flows from positive to negative

Green is the flow of electrons and it flows from negative to positive

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16
Q

What is the flow of electrons measured as

A

I (current) Amps

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17
Q

What is current

A

I

It is measured in amps

It is the flow of electrons that flow past a specific point per second

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18
Q

What is charge

A

Q

Measured in Coulomb

The amount of electrons in a circuit

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19
Q

What is time

A

t

Seconds

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20
Q

How do I measure coulomb

A

Q=I x t

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21
Q

How do I measure time

A

t = Q -:- I

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22
Q

How do I measure ampér

A 
I = Q -:- t
I = V-:- R
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23
Q

What are volts

A

V

Potential difference

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24
Q

What is resistance

Study These Flashcards
A

R

Ohms (^)

Reduce to flow of electrons

25
How do u calculate resistance
R = V -:- I
26
How do u calculate volts
V = I x R
27
What can cells voltage also be referred to as
EMF ( electro motor force )
28
In a battery he long hand is _________ and the short hand is _________ .
Long-positive | Short-negative
29
In South Africa the standard electricity is?
220V
30
What is Ohms law
When voltage is constant then the current is directly dependable on resistance
31
Is resistance dependent or independent
Independent
32
What influences resistance
-width Thinner, more resistance Thicker, less resistance -type of material Copper, great conductor... less resistance Nichrome, bad conductor... more resistance -length Shorter, less resistance Longer, more resistance -temperature Higher... hotter, more resistance Lower... colder, less resistance
33
What is a volt meter
Measures volts Always connected in parallel
34
What is a ammeter
Measures amps Always connected in series
35
When does everything have the same current/amps
In series
36
When does your total resistance have to be smaller than your smallest resistor
In parallel
37
What is parallel also known as
Current dividers
38
How do u measure the total amps in parallel
I T = I 1+ I 2 + I 3
39
How do you measure the total volts in parallel
V T = V 1 = V 2 = V 3
40
The more resistors in parallel....
... less the total resistance
41
How do u measure the total resistance in parallel
1 1 1 1 — = — + — + — R T R1 R2 R3
42
What do batteries store and what do they do with it
They store chemical energy and change it into electrical energy
43
What are the two alternative sources of electricity
Mechanical (movement/friction) Chemical
44
Tell me about Chemical energy
It’s solar (panels) UV trigger the reaction Cells react with the UV
45
Tell me about mechanical electricity
It’s made from movement or friction ➡️ all work with Dynamo / turbine
46
What are the two types of Dynamo / turbine and explain
- Steam (Heat) * nuclear Fission, to split atom, so much energy, creates a lot of heat, boils water almost instantly, turn turbine *coal Burn to heat water to create steam to turn turbine ... non renewable *solar heating Water tower, mirrors, layer, steam, turbine - normal temp *wind turbines *hydro Only water falls, gravity *tidal / wave Tidal, horizontal... side to side Wave, vertical... up, down
47
What is load shedding
Demand for electricity is higher than the production so they decide the national grid into smaller sections to share the load by switching some sections on and others off
48
What is a electrical overload
Too much electricity
49
What happens when there is too little electricity in the National grid
They fix it by load shedding
50
What is fission
The splitting of an atom
51
What is fusion
Two atoms coming together to make one new atom
52
What is power and how do u calculate it
P = V x I It is watts
53
What is the bigger amount of watts and what are the symbols
W Bigger ... kW, kilowatt
54
What do u pay for electricity in
kW / Rand
55
When I say it is a 1100W kettle what does that mean
It means it uses 1100W an hour
56
How do I convert W to kW
1000W = 1kW
57
What are the safety precautions that are required legally
1. Earth circuit breaker Breaks current when the current flows too quickly because there is a leakage 2. Earth wire Discharge leaked electrons out of the hours into the earth (ground)
58
What are the 3 calculators
V I R Q I T P I V

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