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Physics - GCSE > Work And Power > Flashcards

Work And Power Flashcards

(94 cards)

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1
Q

What is the equation for work done?

A

Work done = force x distance moved in direction of force

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2
Q

What are units for work done?

A

Joules, J

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3
Q

What are the units for force?

A

Newtons, N

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4
Q

What are the units used for distance moved in direction of force?

A

Meters, m

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5
Q

What is power?

A

Power is the rare of energy transferred

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6
Q

What is the equation for speed?

A

Speed = distance/ time

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7
Q

What is the equation for power?

A

Power = work done/time taken

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8
Q

What is power measured in?

A

Watts, w

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9
Q

What is time taken measured in?

A

Seconds, s

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10
Q

1 watt = ? j/s

A

1 watt = 1 J/s

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11
Q

What could work done also be seen as?

A

Energy

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12
Q

What is equilibrium?

A

Where the forces on opposite sides are balanced and the objects are either balanced or moving at a constant speed

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13
Q

What are contact forces?

A

Objects affecting each other by touching

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14
Q

What are the three contact forces?

A

Push, pull, friction

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15
Q

What are non contact forces?

A

Forces affecting each other without touching

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16
Q

What are the three non contact forces?

A

Gravity, magnetic fields, electrostatic forces

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17
Q

Where do gravitational fields effect?

A

Around anything with mass

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18
Q

Where do electrostatic fields effect?

A

Around any charged object

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19
Q

Where do magnetic fields effect?

A

Around any magnet

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20
Q

What are the four rules of force pairs?

A

They do not cancel each other out
They act in different objects
They are the same size
They act in opposite directions

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21
Q

What is Newton’s third law?

A

For every force there’s an equal opposite reaction force

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22
Q

What are force pairs an example of?

A

Newton’s third law pairs

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23
Q

What type of force would a chair pushing up on you be?

A

Normal contact force

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24
Q

What are the three rules for forces on a single object?

A

May be the same type or different types
May cancel each other out (balanced
May not cancel each other out (unbalanced

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25
What is weight?
The earth pulling (object) down. Caused by gravity
26
How can we draw a diagram to show vector forces?
Using arrows pointing in the correct direction in a scale diagram
27
What is a scalar quantity?
A scalar quantity has only a size (magnitude) and doesn't have a direction
28
What's an example of a scalar quantity?
Distance
29
What is a vector quantity?
A vector quantity has a size (magnitude) and a direction
30
What is an example of a vector quantity?
Displacement
31
Is charge a vector or scalar quantity?
Scalar
32
Is distance a vector or scalar quantity?
Scalar
33
Is energy a vector or scalar quantity?
Scalar
34
Is frequency a vector or scalar quantity?
Scalar
35
Is mass a vector or scalar quantity?
Scalar
36
Is pressure a vector or scalar quantity?
Scalar
37
Is speed a vector or scalar quantity?
Scalar
38
Is temperature a vector or scalar quantity?
Scalar
39
Is time a vector or scalar quantity?
Scalar
40
Is volume a vector or scalar quantity?
Scalar
41
Is acceleration a vector or scalar quantity?
Vector
42
Is displacement a vector or scalar quantity?
Vector
43
Is electric current a vector or scalar quantity?
Vector
44
Is field strength a vector or scalar quantity?
Vector
45
Is force a vector or scalar quantity?
Vector
46
Is moment a vector or scalar quantity?
Vector
47
Is momentum a vector or scalar quantity?
Vector
48
Is velocity a vector or scalar quantity?
Vector
49
Is weight a vector or scalar quantity?
Vector
50
What are the two average speeds of motorway speed limits?
31m/s and 70mph
51
What are the two average speeds of walking?
1.4m/s and 3.1mph
52
What are the two average speeds of cycling?
6m/s and 13mph
53
What are the two average speeds of airplane?
230m/s and 340mph
54
What are the two average speeds of speed limit in town?
13m/s and 30mph
55
What are the two average speeds of commuter train?
55m/s and 123mph
56
What are the two average speeds of sound?
342m/s and 515mph
57
What does speed tell you about an object
How quickly it travels a certain distance
58
What are the three units of speed?
Km/h, m/s, mph
59
What are the two scientific meanings of 'fast?
Travel further in the same time or travel the same distance in less time
60
Speed equation
Speed = distance / time
61
Units for speed
m/s
62
Units for distance
m
63
Units for time
s
64
In the triangle, what is distance represented by?
The letter x
65
What do we use distance time graphs for?
To represent a journey in an easy way
66
What is velocity equation?
Velocity = displacement / time
67
What is acceleration equation?
Change in velocity / time
68
When does velocity changes?
When direction changes
69
What types of velocity can you have?
Positive and negative
70
Average speed equation
Total distance / time for whole journey
71
What are two base rules of acceleration ?
Always has a direction, can be positive or negative
72
What is units for acceleration?
m/s^2
73
What is change in velocity units?
m/s
74
What is time units?
s
75
What are the letter/triangle equation for acceleration?
a= v-u/t
76
What does the letter v represent?
Final velocity
77
What does the letter u represent?
Staring velocity
78
How do you work out change in velocity?
Final velocity - starting velocity
79
What happens to the acceleration of an object when the velocity changes?
It accelerates
80
An airliners velocity changes from 0m/s to 60m/s in 20 seconds. What is it's acceleration?
a=v-u/t = 60-0/20 =3m/s^2
81
If an object is slowing down, what happens to its acceleration?
It's decelerating, will have a negative acceleration
82
What is acceleration due to gravity?
10
83
What is the acceleration equation?
(Final velocity)^2 - (initial velocity)^2 = 2x acceleration x distance V^2-u^2=2xax x
84
A car travelling at 15 m/s accelerates at 1.5m/s^2 over a distance of 50m. Calculate it's final velocity.
``` V^2=(2xax x) + u^2 =(2x1.5x50)+(15x15) V^2= 375(m/s)^2 V = (square root of 375) m/s^2 =19.4 m/s ```
85
What are SI units for velocity?
M/s
86
What are SI units for acceleration?
M/s^2
87
A cyclist accelerates from 2m/s to 8m/s with an acceleration of 1.5m/s^2. How far did she travel while she was accelerating? Use the formula: x=(v^2-u^2)/2xa
X=(8^2-2^2)/2x1.5 X=64-4/3 X=20m
88
On a velocity time graph, how do you work out the distance travel?
Area of the graph (under the line)
89
How is acceleration represented in a velocity time graph?
The gradient of the line
90
If the line is going downwards on a velocity time graph, what does it mean?
Negative velocity
91
If the angle on the road is changing while a car is driving , what does this mean for direction mad velocity?
They're both changing
92
A car drives around a roundabout at 30km/h. How is speed effected? How is velocity effected? How is acceleration effected?
Speed stays the same Velocity is changing because care is moving in a different direction It is accelerating because velocity is changing
93
How do you work out resultant force?
Subtract all relevant forces from each other
94
An object has a resultant force of 0N. What does this mean?
It's stationary or moving at constant speed

Physics - GCSE (6 decks)

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