1.1 Basic Physics Flashcards
(66 cards)
1
Q
Symbol for mass
A
m
2
Q
Symbol for length
A
l
3
Q
Symbol for time
A
t
4
Q
Symbol for electric current
A
I
5
Q
Symbol for temperature
A
T
6
Q
Symbol for amount of substance
A
n
7
Q
Symbol for luminous intensity
A
L
8
Q
Unit of mass
A
kilogram (kg)
9
Q
Unit of length
A
metre (m)
10
Q
Unit of time
A
second (s)
11
Q
Unit of electric current
A
ampere (A)
12
Q
Unit of temperature
A
kelvin (K)
13
Q
Unit of amount of a substance
A
mole (mol)
14
Q
Unit of luminous intensity
A
candela (cd)
15
Q
Equation for area
A
area=length*breadth
16
Q
Unit of area
A
m^2
17
Q
Equation for change of speed or velocity
A
change of speed=final velocity-initial velocity
18
Q
Unit of change of speed/velocity
A
ms^-1
19
Q
Equation for acceleration
A
acceleration=change of velocity/time a=Δv
20
Q
Symbol for acceleration
A
a
21
Q
Unit of acceleration
A
ms^-2
22
Q
symbol for change of speed/velocity
A
Δv
23
Q
Equation for Force
A
Force=mass*acceleration F=ma
24
Q
Symbol for force
A
F
25
Unit of force
Newtons (N) (kgms^-2)
26
Equation for work
Work=Force*distance
27
Unit of work
Joules (J) (kgm^2s^-2)
28
Equation for Power
Power=work/time
29
Unit of power
Watt (W) (kgm^2s^-3)
30
What are the rules for homogentity?
1. Two quantities can only be added together if the have the same units, and the answer has the same units.
2. An equation is homogeneous only if the units of the two sides are the same.
31
What is a vector quantity?
A vector quantity has magnitude and direction, eg Force
32
What is a scalar quantity?
A scalar quantity just has magnitude eg mass
33
What is resultant force?
The combined effect of two or more forces is called the resultant force (Fres) [res is subscript]
34
How do you calculate Resultant Force?
Use the cosine rule of Pythagoras' theorum
35
Symbol for Resultant Force
Fres [res is subscript] or ΣF
36
What is displacement?
The distance and direction from A to B, in a straight line/ eg point A is 9cm W of point B
37
Equation for velocity
velocity=displacement/time
38
Unit for velocity
metres per second in a stated direction (ms^-1 at compass point)
39
Equation for acceleration
acceleration=change of velocity/time a=Δv/Δt
40
How do you add and subtract vectors?
Use nose-to-tail method
41
What is "resolving" a force?
Calculating the horizontal and vertical components
42
Equation for Density
Density=mass/volume ρ=m/V
43
Symbol for density
ρ
44
Unit of Density
kgm^-3 or gcm^-3
45
Approximate density of air
1.29ρ/kgm^-3 0.00129ρ/gcm^-3
46
Approximate density of water
1000ρ/kgm^-3 1.00ρ/gcm^-3
47
Approximate density of brick
2300ρ/kgm^-3 2.30ρ/gcm^-3
48
Approximate density of petrol
880ρ/kgm^-3 0.88ρ/gcm^-3
49
Approximate density of steel
7900ρ/kgm^-3 7.90ρ/gcm^-3
50
Approximate density of aluminium
2800ρ/kgm^-3 2.80ρ/gcm^-3
51
Approximate density of mercury
13600ρ/kgm^-3 13.6ρ/gcm^-3
52
Approximate density of gold
19300ρ/kgm^-3 19.3ρ/gcm^-3
53
What would the width of 1 tonne of interstellar space be?
10^6km
54
What would the width of 1 tonne of red giant star be?
100m
55
What would the width of 1 tonne of the sun be?
0.89m
56
What would the width of 1 tonne of a white dwarf be?
8.9mm
57
What would the width of 1 tonne of a neutron star be?
15µm (micro metres)
58
How do you convert cm^3 to m^3?
1 cm^3 = 1*10^6 m^3
59
How do you convert density from kg-g?
1000kgm^-3 = 1.00gcm^-3
60
Define torque/ the moment of a force
The product of a force multiplied by the perpendicular distance from the line of action to the pivot.
61
Unit of moment/Torque
Newtons per metre (Nm)
62
Symbol for torque/moment of a force
t
63
What is the principal of moments?
For a body to be in equilibrium under the action of a number of forces, the resultant moment about any point is zero.
64
Define equilibrium
A body is in equilibrium if it is moving and rotating at a constant rate. In order for this to happen:
1. The resultant force on the object must be zero.
2. The resultant moment around any point must be zero.
65
How would you measure the density of a regular solid?
Calculate the volume using
Volume of a cuboid= lbh
Volume of a cylinder = Al = π r^2 l = (π r^2 l)/4
66
How would you measure the density of a irregular solid?
Submerge the solid in a measuring cylinder of water and measure the displacement of the water.
