more defenitions Flashcards
prefix’s in order
pico , nano, micro, milli, centi, decid, kilo, mega, giga, tera.
please nana make me come down kangaroo mountine, im goign tomorrow
number of pico
x10-12
number for nano
x10-9
number for micro
x10-6
millie number
x10-3
centi number
x10-2
deci number
x10-1
kilo number
x10 3
number of kilo
x10 3
mega number
x10 6
giga number
x10 9
tera
x10 12
avagados constant
the number of atoms in 0.012kg of carbon-12
defenition of scalar
a quantity which has magnitude only
vector quantity
a quanitity which has both magnitude and direction
displacement
the distance moved by a object in a particular direction (measurd from a fixed starting point)
frequency period equation
frequency = 1/ period
change in gpe equation
weight x change in height
electric field strength=
force/charge
relation ship efs and volt
efs proptional volt
efs relationship to distance
efs proportional 1/ distance between
efs =
voltage/ distnace
work in term of electricity
ampsx volts
velocity current relationhsip
velocity proportional to current
density equation
mass/volume
elastic potential equation
1/2x forcexextension
impulse=
change in momentum = momentum after -momentum before
change in momentum=
mass x change in velocity
impules = (time)
force x change in time
resistance =
resistivity x length over areA
power =
energy over time
force ( momentum ) equations
change in momentum over time
pressur density equation
pressure= density g change in height
phase difference diffraction gratting equatikns
n(lambda)=dsin(pheta)
intesity
= power /area
dopler effect equation not moveing
observer wavelength= velocity of wave/frequency of source
doppler effect moveing
ovserver wavelength = velocity of wave+- velocity of source/ frequency of source
current charge equation
current = charge/time
drift velocity equation
drift velocity=length/time
pressure density relation
proportional
pressure temperture relation
proportional
speed
rate of change of the distance moved by the object
velocity
the rate of change of the displacement of an object
acceleration
rate of change of velocity
density
the mass per unit of volume of material
pressure
the force acting normally per unit area of a surface
efficiency of a substance
the rationof useful output energy to the total input for a device expressed as a percentage
gravitational potential energy
the energy a body has due to its position in a gravitational field
gravitational potential
the gravitational potential energy per unit mass at a point in a gravitational field
elastic potential energy
energy stored ins streched or compressed material
power
the rate at which energy is transfered or the rate at which work is done
work done
the producy of the force and the distnace moved in the directionofnthe force
radian
a unit measurinv angels 2pi= 360 degree
gravitation field stength
the gravitational force experiancex by an object per unit of mass
gravitational field
a region where an object with mass experiancesforce
stress
the force acting per unit cross sectional area
strain
the extension per unit length produced by tensile or compressef force
younge modulus
the ratio of stress to strain of a given material resulting from tensile forces providing hooks law is obeyed
iterference
the formation of points of cancellation and reinforcment where two coherent waves pass through each other
coherance
two sources are coherent wher they emit waves with a constant phase diffeernece
resistivity
a property of a material a measure of its electrical resistance defined by p=ra/l
electric motive forcd
the total work done when unit charge is moved round a comoete circuit
potential difference
the enregy lost per unit charge by charges passing through a component
couloimb
the si unit of electircal charge a charge of 1C passes a point when a current of 1 A mflows for 1s
amplitude
the maximum displacement if a waveform its point of equilibrium
phase difference
the dofference in the phases of two oscillating waves
period
the length of time taken for one oscillation
frequency
the number of oscillqtions per unit of time
wavelength
the distance between two adjacent peaks anor troughs in a wave
speed of a wave
the frequency x wavelength
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
node
a point on a stationary wave with zero amplitude
anti node
a point on a stationary wave with maximum amplitude
diffractiom
the spreading ofwaves when it passes through s gsp or past the edge of a object
elastic collision
when momentum and kinetic energy are both conserved as well as kinetic energy
inelastic collison
a collison is inelaastinc when kinetic energy is not consereved
torque of a couple
the product of one of the forces of a couple and the perpendiculat distance between them
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
principle of conservation of emergy
within a closed systum energy is all its forms is uncahged
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
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
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
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
ohms law
the current in a metsllic conductor is directly proportional to te potential difference across its ends provided its temperature does not change
newtons 1st
an object remains at rest or moving at a constant velocity unless it is actin appon by a resultant force
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
newtons 3rd
when two bodies interact the forces they exert on each other are equal and opposite
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
hooks law
the extension is produced in a object is proportional to the force producing it
displacment from a velocity time graph
area
velocity from a displacemnt time graph
gradient
acceleration from anvelocity time graoh
gradient
work done from a force extension graph
area
