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GCSE Combined Physics (Edexcel) > Topic 7 & 8 - Forces Doing Work and Forces and their Effects COMPLETE PK > Flashcards

Topic 7 & 8 - Forces Doing Work and Forces and their Effects COMPLETE PK Flashcards

1
Q

1 What are the units for energy?

A

joules

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2
Q

2 How is energy transferred to a light bulb?

A

by electricity

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3
Q

3 How is energy transferred away from a light bulb?

A

by light, by heating

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4
Q

4 Describe one other way in which energy can be transferred.

A

by sound, by forces

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5
Q

5 What is a force?

A

a push or a pull

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6
Q

6 What are the units for measuring forces?

A

newtons

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7
Q

7 What is your weight?

A

the force of gravity pulling on you

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8
Q

8 What does work done mean in physics?

A

energy transferred by a force

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9
Q

9 What does power measure?

A

how fast energy is transferred/work is done

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10
Q

10 What are the units for power?

A

watts

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11
Q

11 What does work done mean?

A

energy transferred by a force

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12
Q

12 What are the units for work done?

A

joules

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13
Q

13 How do you calculate work done?

A

Multiply force by distance moved in the direction of the force.

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14
Q

14 What does power mean?

A

how fast energy is transferred

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15
Q

15 What are the units for power?

A

watts

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16
Q

16 How do you calculate power?

A

work done divided by time

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17
Q

17 Two people with the same weight go up a flight of stairs. How can you tell which one has exerted more power?

A

the one that went up fastest

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18
Q

18 Name two non-contact forces.

A

two from: gravity, magnetism, static electricity

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19
Q

19 What is a magnetic field?

A

the space around a magnet where it can affect things

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20
Q

20 What is a vector quantity?

A

a quantity that has both magnitude and direction

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21
Q

21 Name two contact forces.

A

any two from: normal contact force, upthrust, air resistance, etc.

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22
Q

22 Name three non-contact forces.

A

gravity, magnetism, static electricity

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23
Q

23 How is a force represented in a diagram?

A

arrow showing direction, with length indicating size

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24
Q

24 What are the units for measuring force?

A

newtons

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25
25 Why is weight a vector quantity?
It has a direction as well as a magnitude.
26
26 The Earth attracts the Moon via gravity. What is the other force in this action?reaction pair?
the Moon attracting the Earth
27
27 What is the name for the space around an object where it attracts things with mass?
a gravitational field
28
28 What is the name for the space around something with an electric charge where it can affect other objects?
an electrostatic or electric field
29
29 What is the name for a single force that represents the combined effects of all the forces on an object?
a resultant force
30
30 What is the name for a diagram where a measurement on the diagram represents a larger measurement in real life?
a scale diagram
31
What is the acronym used for remembering the different types of energy?
GEEKS LUNCH (the U doesn't stand for anything!!)
32
What does the G in GEEKS LUNCH stand for?
Gravitational potential energy
33
What do the Es in GEEKS LUNCH stand for?
Electrical energy and elastic potential energy
34
What does the K in GEEKS LUNCH stand for?
Kinetic (movement) energy
35
What does the S in GEEKS LUNCH stand for?
Sound energy
36
What does the L in GEEKS LUNCH stand for?
Light energy
37
What does the U in GEEKS LUNCH stand for?
NOTHING
38
What does the N in GEEKS LUNCH stand for?
Nuclear energy
39
What does the C in GEEKS LUNCH stand for?
Chemical energy
40
What does the H in GEEKS LUNCH stand for?
Heat (thermal) energy
41
Most things involve only/more than one type of energy
More than one
42
Give 3 types of energy found in a phone?
Any 3 from electrical energy going in, chemical energy being stored, heat energy, light energy and sound energy going out
43
What type of energy is stored in a match?
Chemical energy
44
What type of energy is used to strike a match?
Kinetic energy
45
What types of energy come out of a match?
Heat, light and a bit of sound
46
What type of energy are fireworks stored as?
Chemical
47
What type of energy are fireworks transferred into as they move up?
Kinetic
48
What type of energy are fireworks stored as as they explode?
Heat, light and sound
49
What type of energy are fireworks stored as as they start to fall/fall back down?
Gravitational potential energy and then kinetic energy
50
What does the law of conservation of energy tell us?
Energy cannot be created or destroyed, only transformed into another type of energy
51
Energy can/cannot be created or destroyed
cannot
52
True/False: Energy can be transformed into another type of energy
True
53
True/False: Energy cannot be wasted
False, it can be wasted
54
What is wasted energy?
Energy that comes out of a situation that we didn't intend to be there
55
What is the useful energy that comes out of a light bulb?
Light
56
What is the wasted energy that comes out of a light bulb?
Heat and sound
57
Wasted energy __________ into the surroundings
dissipates
58
What happens to energy when it dissipates into the surroundings?
It spreads out so much that it can't be collected and used. It's not gone - it's still there. It is just spread out
59
How do we visually show the efficiency or something?
A sankey diagram
60
Work done =
force x distance
61
What is work done measured in?
Joules
62
What is force measured in?
Neutons
63
What is distance measured in?
metres
64
What is a joule equal to in terms of neutons and metres
1 Nm
65
Change in gravitational potential energy =
Mass x gravity x change in height
66
What is gravitational potential energy measured in?
Joules
67
What is the gravity on earth?
10N
68
Kinetic energy =
1/2 x mass x velocity squared
69
What is kinetic energy measured in?
Joules
70
What is mass measured in?
kg
71
What is velocity measured in?
m/s
72
Power =
Energy transferred / time
73
What are the units for power?
Watts
74
Efficiency = (in terms of power)
Useful power out / total power in
75
Efficiency = (in terms of energy)
Useful energy out / total energy in
76
Efficiency can be expressed as a percentage or a...
decimal
77
What is a scalar quantity?
Just a number
78
What is a vector quantity?
A number and a direction
79
Is distance a scalar or vector quantity?
Scalar
80
Is mass a scalar or vector quantity?
Scalar
81
Is displacement a scalar or vector quantity?
Vector
82
Is weight a scalar or vector quantity?
Vector
83
Is speed a scalar or vector quantity?
Scalar
84
Is velocity a scalar or vector quantity?
Vector
85
Is acceleration a scalar or vector quantity?
Vector
86
Is force a scalar or vector quantity?
Vector
87
Is momentum a scalar or vector quantity?
Vector
88
What is the resultant force?
Difference between forces

GCSE Combined Physics (Edexcel) (10 decks)

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