more defenitions Flashcards
1
Q
prefix’s in order
A
pico , nano, micro, milli, centi, decid, kilo, mega, giga, tera.
please nana make me come down kangaroo mountine, im goign tomorrow
2
Q
number of pico
A
x10-12
3
Q
number for nano
A
x10-9
4
Q
number for micro
A
x10-6
5
Q
millie number
A
x10-3
6
Q
centi number
A
x10-2
7
Q
deci number
A
x10-1
8
Q
kilo number
A
x10 3
9
Q
number of kilo
A
x10 3
10
Q
mega number
A
x10 6
11
Q
giga number
A
x10 9
12
Q
tera
A
x10 12
13
Q
avagados constant
A
the number of atoms in 0.012kg of carbon-12
14
Q
defenition of scalar
A
a quantity which has magnitude only
15
Q
vector quantity
A
a quanitity which has both magnitude and direction
16
Q
displacement
A
the distance moved by a object in a particular direction (measurd from a fixed starting point)
17
Q
frequency period equation
A
frequency = 1/ period
18
Q
change in gpe equation
A
weight x change in height
19
Q
electric field strength=
A
force/charge
20
Q
relation ship efs and volt
A
efs proptional volt
21
Q
efs relationship to distance
A
efs proportional 1/ distance between
22
Q
efs =
A
voltage/ distnace
23
Q
work in term of electricity
A
ampsx volts
24
Q
velocity current relationhsip
A
velocity proportional to current
25
density equation
mass/volume
26
elastic potential equation
1/2x forcexextension
27
impulse=
change in momentum = momentum after -momentum before
28
change in momentum=
mass x change in velocity
29
impules = (time)
force x change in time
30
resistance =
resistivity x length over areA
31
power =
energy over time
32
force ( momentum ) equations
change in momentum over time
33
pressur density equation
pressure= density g change in height
34
phase difference diffraction gratting equatikns
n(lambda)=dsin(pheta)
35
intesity
= power /area
36
dopler effect equation not moveing
observer wavelength= velocity of wave/frequency of source
37
doppler effect moveing
ovserver wavelength = velocity of wave+- velocity of source/ frequency of source
38
current charge equation
current = charge/time
39
drift velocity equation
drift velocity=length/time
40
pressure density relation
proportional
41
pressure temperture relation
proportional
42
speed
rate of change of the distance moved by the object
43
velocity
the rate of change of the displacement of an object
44
acceleration
rate of change of velocity
45
density
the mass per unit of volume of material
46
pressure
the force acting normally per unit area of a surface
47
efficiency of a substance
the rationof useful output energy to the total input for a device expressed as a percentage
48
gravitational potential energy
the energy a body has due to its position in a gravitational field
49
gravitational potential
the gravitational potential energy per unit mass at a point in a gravitational field
50
elastic potential energy
energy stored ins streched or compressed material
51
power
the rate at which energy is transfered or the rate at which work is done
52
work done
the producy of the force and the distnace moved in the directionofnthe force
53
radian
a unit measurinv angels 2pi= 360 degree
54
gravitation field stength
the gravitational force experiancex by an object per unit of mass
55
gravitational field
a region where an object with mass experiancesforce
56
stress
the force acting per unit cross sectional area
57
strain
the extension per unit length produced by tensile or compressef force
58
younge modulus
the ratio of stress to strain of a given material resulting from tensile forces providing hooks law is obeyed
59
iterference
the formation of points of cancellation and reinforcment where two coherent waves pass through each other
60
coherance
two sources are coherent wher they emit waves with a constant phase diffeernece
61
resistivity
a property of a material a measure of its electrical resistance defined by p=ra/l
62
electric motive forcd
the total work done when unit charge is moved round a comoete circuit
63
potential difference
the enregy lost per unit charge by charges passing through a component
64
couloimb
the si unit of electircal charge a charge of 1C passes a point when a current of 1 A mflows for 1s
65
amplitude
the maximum displacement if a waveform its point of equilibrium
66
phase difference
the dofference in the phases of two oscillating waves
67
period
the length of time taken for one oscillation
68
frequency
the number of oscillqtions per unit of time
69
wavelength
the distance between two adjacent peaks anor troughs in a wave
70
speed of a wave
the frequency x wavelength
71
doppler shift
the change in frequency or wavelength of a wvae observed when the source kf the wave is moveing towards or away from the ovserver or the observer is moving relative too the source
72
node
a point on a stationary wave with zero amplitude
73
anti node
a point on a stationary wave with maximum amplitude
74
diffractiom
the spreading ofwaves when it passes through s gsp or past the edge of a object
75
elastic collision
when momentum and kinetic energy are both conserved as well as kinetic energy
76
inelastic collison
a collison is inelaastinc when kinetic energy is not consereved
77
torque of a couple
the product of one of the forces of a couple and the perpendiculat distance between them
78
principle of moment
for an object in equillibrium the sum of the clockwise moments about a point is equal to the sum of te anti clockwise moment about the same piint
79
principle of conservation of emergy
within a closed systum energy is all its forms is uncahged
80
stationary wave
a wave pattern produced when two progressive waves of the same frequency travelling in opposite directions combine it is characterised by nodes and anti nodes
81
principle of superpostition
when two or more wave meet at a point rhe resulting displacement is the sum of the displacement of the individual waves
82
kirchoffs 1st
the sum of the current entering any point or junction in a circuit is equal to the sum of e chrrent leaving at the same point
83
kirchoffs 2nd
the sum if te emfs round a closed loop ina circuit is equal to the sum of e p.d. in the same loop
84
ohms law
the current in a metsllic conductor is directly proportional to te potential difference across its ends provided its temperature does not change
85
newtons 1st
an object remains at rest or moving at a constant velocity unless it is actin appon by a resultant force
86
newtons secound
force =mass x velocity th resultinf force acting in a object is equal to te rst eof change of its momentum. the resultsnt force and te cha ge in momentum are int te same direction
87
newtons 3rd
when two bodies interact the forces they exert on each other are equal and opposite
88
newtons law of gravitatjon
a y two masses attract each other with a force that is directly proprtional to the product of thefe mass es and jnversly proportional to rhe squate of there seperation
89
hooks law
the extension is produced in a object is proportional to the force producing it
90
displacment from a velocity time graph
area
91
velocity from a displacemnt time graph
gradient
92
acceleration from anvelocity time graoh
gradient
93
work done from a force extension graph
area
