1
Q
What do scarlet quantities have?
A
Magnitude only
2
Q
What do vector quantities have.
A
Magnitude and an associated direction
3
Q
How can a vector quantity be represented by?
A
An arrow
4
Q
What does the length of an arrow used to show vector quantity represent?
A
The magnitude
5
Q
What does the direction of the arrow used to show vector quantities used for?
A
To show the direction of the vector quantities
6
Q
What is a force?
A
A punch or pull that acts on an object due to the interaction with another object
7
Q
What are all forces between objects?
A
Either non contact or contact
8
Q
What is a contact force?
A
The objects are physically touching
9
Q
What are non contact forces?
A
The objects are physically separated
10
Q
What are examples of contact forces?
A
Friction air resistance tension and normal contact force
11
Q
What are examples of non contact forces
A
Gravitational force electro static force and magnetic force
12
Q
What quantity is a force?
A
Vector
13
Q
What is weight ?
A
The force acting on an object due to gravity
14
Q
What does the weight organ object depend on?
A
The gravitational field strength at the point where the object is
15
Q
What is the force of gravity close to the earth due to?
A
The gravitational field around the earth
16
Q
What is the equation to find the weight of an object ?
A
Weight = mass x gravitational field strength
17
Q
What is the symbol for weight?
A
W
18
Q
What is weight measured in ?
A
Newtons N
19
Q
What is the symbol for mass?
A
m
20
Q
A
21
Q
What is mass measured in?
A
Kilograms kg
22
Q
What is the symbol for gravitational field strength?
A
g
23
Q
What is gravitational field strength measured in?
A
N/kg
24
Q
What is the centre of mass?
A
The weight of an object may be considered to act at a single point
25
What is the weight of an object directly proportional to?
The mass of an object
26
What is used to measure weight?
Calibrated spring balance or newton meter
27
What is displacement?
Distance ina given direction
28
What is the resultant force
A single force that has the same effect as all the forces acting on a object
29
What is a free body force diagram?
A diagram that shows the forces acting on an object without any other objects or forces shown
30
What happens if the resultant force on an object is zero?
The object stays at rest or at the same speed and direction
31
What happens if the resultant force is greater than zero?
The speed or direction of the object will change
32
If 2 forces act on an object along the same line and the forces acting in the same direction what will the resultant force be?
Their sum
33
If 2 forces act on an object along the same line and the forces acting in opposite directions what will the resultant force be?
Their differences
34
What can a single,d for d be resolved into?
2 components acting at right angles to each other
35
What do the two components forces tough have the same effect as?
The single force
36
What is work
When a force causes an object to move through a distance work is done on the object
37
38
What is the equation for work done?
Force x distance
39
What is the symbol for work done?
W
40
What is work done measured in?
Joules
41
What is the symbol for force?
F
42
What is the force measured in?
Newtons
43
What is the symbol for distance?
s
44
What is distance measured in ?
Metres
45
What does 1 joule equal to?
1 newton metre
46
What is done when a force of one newton causes a displacement of one metre?
One joule of work is done
47
What happens when work done against the frictional forces acting on an object ?
Causes a rise in the temperature of the object
48
What is the extension of an elastic object directly proportional to?
The force applied provided that the limit of proportionality is not exceeded
49
What is the equation for force?
Force = spring constant x extension
50
What is the symbol for spring constant?
K
51
What is spring constant measured in?
Newtons per metre N/m
52
What is the symbol for extension?
e
53
What is stored in a spring that a force stretches of compresses.?
It does work and elastic potential energy is stored in the spring
54
What is the work done on a spring equal to provided the spring is not inelasticslly deformed
55
What may cause an object to rotate?
A force or a system
56
What is the turning effect of a force called?
The moment of the force
57
What is the equation for moment of a force?
Force x distance
58
What is the symbol for moment of a force ?
M
59
What is moment of a force measure in?
Newtons per metre
60
What is distance in a moment of a force?
The perpendicular distance from the pivot to the line of action of the force in metres
61
If an object is balanced what is the total clockwise moment about a pivot equal to?
The total anticlockwise moment about that pivot
62
What can be used to transmit the rotational effects of forces?
A simple lever and simple gear system
63
What fluid either be?
A liquid or a gas
64
What does the pressure in fluids cause?
A force normal at right angles to any surface
65
What is the equation for pressure?
Force normal to a surface / area of that surface
66
What is the symbol for pressure?
p
67
What is pressure measured in?
Pascals pa
68
What is area measured in?
Metres squared
69
What is the symbol for area?
A
70
What is the equation for pressure due to a column of liquid ?
Pressure = height of the column x density of the liquid x gravitational field strength
71
What is height of column measured in?
h
72
What is the density measured in.
Kilograms per metre cubed
73
What is upthrust?
The upward force that acts on a body partly or completely submerged in a fluid
74
What is the atmosphere?
A thin layer of air around the earth
75
How does the atmosphere get less dense?
With increasing altitude
76
What creates atmospheric pressure?
Air molecules colliding with a surface
77
How does the number of air molecules above a surface decrease?
As the height of the surface above ground level increases
78
As height increases there is always …
Less air above surface than there is at a lower height
79
Atmospheric pressure decreases…
With increasing height
80
What is distance?
How far an object moves does not involve direction is a scalar quantity
81
What does displacement include?
Both the distance and object moves measured ina straight line from the start point to the finish point and the direction of that straight line
82
Is displacement a vector or scalar quantity?
Vector
83
Is speed a vector or scalar quantity?
Scalar
84
What does the speed at which a person can walk run or cycle depend on?
Age terrain fitness and distance traveled
85
What is the typical value of speed for walking?
1.5m/s
86
What is typical value for running?
3m/s
87
What is the typical value for cycling?
6m/s
88
What happens when people walk run or travel Ina car?
Their speed is constantly changing
89
What is the typical value of the speed of sound?
330m/s
90
What is the equation for distance traveled?
Speed x time
91
What is the velocity of an object?
It’s speed Ina given directions
92
Is velocity a vector or scalar quantity?
Vector
93
What does a distance time graph represent?
The distance travelled by a object moving along a straight line
94
How can the speed of an object be calculated by a distance time graph?
From the gradient
95
How can the speed be found from a distance time graph if an object is accelerating?
By drawing a tangent
96
What is the equation for acceleration?
Change in velocity/ time taken
97
What is the symbol for acceleration.
a metres per second
98
What is decelerating?
An object that slows down
99
What is the equation for uniform acceleration?
(Final velocity)squared - ( initial velocity)squared = 2 x acceleration x distance
100
What is the acceleration of any object falling freely under gravity near the earths surface?
9.8m/s
101
Why does an object falling through a fluid initially accelerate?
Due to the force of gravity
102
What happens after and object falls through a liquid and initially accelerates?
Eventually the resultant force will be zero and the object will move at its terminal velocity
103
What is Newton’s first law?
If the resultant force acting on an object is zero and the object is stationary the object remains stationary
If the resultant force acting on a n object is zero and the object moving , the object continues to move at the same speed and in the same direction so the object contains to move at the same velocity
104
What is inertia?
The tendency of objects to continue in their state of rest or of uniform motion
105
What is Newton’s second law?
The acceleration of an object is proportional to the resultant force
acting on the object, and inversely proportional to the mass of the
object.
106
When will the velocity of any object object change?
If a resultant force is acting on the object
107
What is the equation for the resultant force?
Mass x acceleration
108
What is inertia mass?
A measure of how difficult it is to change the velocity of any object falling object
109
What is inertia mass defined as?
The ratio of force over acceleration
110
What is Newton’s third law?
Whenever two objects interact, the forces they exert on each other
are equal and opposite.
111
What is the stopping distance of a vehicle?
the sum of the distance the
vehicle travels during the driver’s reaction time (thinking distance)
and the distance it travels under the braking force (braking
distance). For a given braking force the greater the speed of the
vehicle, the greater the stopping distance.
112
What are the typical value range of stopping distance?
0.2s to 0.9
113
What a drivers reaction time be affected by?
tiredness, drugs and
alcohol. Distractions may also affect a driver’s ability to react.
114
What can the braking distance of a vehicle be affected by?
y adverse road
and weather conditions and poor condition of the vehicle
115
What do adverse roads and poor conditions of the vehicle include?
Adverse road conditions include wet or icy conditions. Poor
condition of the vehicle is limited to the vehicle's brakes or tyres.
116
The greater the speed of a vehicle’s the ….
Greater the braking force needed to stop the vehicle in a certain distance
117
What happens when a force is applied to the brakes of a vehicle ?
Work done by the friction force between the brakes and the wheel reduces the kinetic energy of the vehicle and the temperature of the brakes increases
118
What may large decelerations lead to ?
Brakes overheating and loss of control
119
The greater the breaking force the greater….
The deceleration of the vehicle
120
What is the equation for momentum?
Momentum = mass x velocity
121
What is the symbol and and measurement for momentum?
p and kg m/s
122
What is the conservator momentum?
In a closed system the total momentum before an event is equal to the total momentum after the event
Physics
flashcards
Decks in class (13)
# Cards
-
P114
-
4.1.1 Energy Changes In A System And The Ways Energy Is Stored Before And After Such Changes36
-
P217
-
Energy Changes In A System An The Ways Energis Stored Before And After Such Changes2
-
4.1 Energy Changes In A System And The Ways Energy Is Stored Before And After Such Changes65
-
4.2 Electricity108
-
4.3 Particle Model Of Matter57
-
4.4 Atomic Structure52
-
4.5 Forces122
-
4.7 Magnetism And Electromagnetism34
-
4.6 Waves86
-
4.8 Space Physics16
-
Physics 2020 Paper 114
