Physics Flashcards
x = 1/2 (vi + vf )t
Δx - displacement
t - time
vi - initial velocity
vf - final velocity
vf = vi + at
a - acceleration
t - time
vi - initial velocity
vf - final velocity
Δx = vi t + 1/2 at^2
a - acceleration
Δx - displacement
t - time
vi - initial velocity
v final ^2 = v initial^2 + 2aΔx
a - acceleration
Δx - displacement
vi - initial velocity
vf - final velocity
Newton’s 1st law
interia
objects at motion stay at motions unless acted on
Newtons 2nd Law
F = ma
Newtons 3rd Law
Equal and opposite reactions
FAB = - FBA
Static Friction
Fmax = μs x N
Fmax - maximum static friction force
N - normal force
ųs - coefficient of static friction
Kinetic Friction
Fkinetic = ųk x N
Fkinetic - kinetic friction force
N - normal force
ųk - coefficient of kinetic friction
Gravitational formula
Fgrav = G m1m2/ r^2
F grav - gravitational force
G - universal gravitational constant
m - mass of first and second objects
Centripetal acceleration
a = v^2/r
a - centripetal acceleration
v - velocity
r - distance of an object from the center of orbit
Centripetal force
Fc = mv^2/r
Fc - centripetal force
m - mass of an object
v - velocity
r - distance of an object from the center of orbit
Hookes Law
Fspring = -kx
Troque
τ = F · d · sin(θ)
τ - torque
F - applied force
d - lever arm (distance from fulcrum)
θ - angle between applied force and lever arm
Work
W = | F | · d · cos(θ)
W - work
F - applied force
d - displacement over which the force is applied
θ - angle between applied force and displacement
Power
P = W/Δt
P - power
W - work or change in energy
Δt - time
Kinetic Energy
1/2mv^2
Potential Energy
mgh
Elastic potential energy (spring)
1/2kx^2
Conversation of energy
KE intial + PE intital = KE final + PE final
Work-Energy theorem
W = ΔKE = KEfinal - KEinitial
Work (Pressure-Volume curve)
W = PΔV
First Law of Thermodynamics
Conservation of energy
ΔU = Q - W
ΔU - change in internal energy of the system
Q - heat entering the system
W - work done by the system
Ideal Gas Law
PV = nRT
Density
ρ = m/V
ρ - density
m - mass
V - volume
Specific gravity
ρ/ρwater
Pressure
P = force/area
Hydrostatic pressure
Psub = ρgh
Sub = gauge pressure
Absolute pressure
Pabs = Patm + ρgh
Part of object submerged
ρobject/ ρliquid · 100
Buoyant Force
Fbuoy = ρVg
Pascals Law - pressure
P= F1/A1= F2/A2
F=force
A=area
Pascals Law = work
W = F1d1= F2d2
W - work
F - Force
d - displacement
Coulombs Law
F = kq1q2/r^2
F - electrostatic force
k - Coulomb’s constant
q - charge of a particle
r - distance between charges
Ohms Law
V = IR
V - voltage
I - current
R - resistance
Current in series
Itotal = I1 = I2 = … = In
Voltage in series
Vsource = V1 + V2 + … + Vn
Resistance in series
Rtotal = R1 + R2 + … + Rn
Current in parallel
Itotal = I1 + I2 + … + In
Voltage in parallel
Vtotal = V1 = V2 = … = Vn
Resistance in parallel
1/Rtotal = 1/R1+ 1/R2 + … + 1/Rn
Capacitance
C = Q/V
C - capacitance
Q - charge stored in capacitor
V - voltage across capacitor
Velocity of a wave
v = wavelength x frequency
Doppler effect
f΄= f0(vsound+ vobserver /(vsound + vsource)
Standing wave for a string or pipe open at both ends
wavelength = 2L/n
Standing wave for a pipe closed at one end
wavelength = 4L/n(odd)
Rydberg Equation
1/λ = R ( 1/n1^2 - 1/n2^2)
R - the Rydberg constant
n - orbital levels
λ - wavelength of photon
Half life
t1/2 = 0.693/decay constant
