Physics Formulas Flashcards by J H

Force

F.net = ma

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Component vectors

X = V * cos(theta)
Y = V * sin(theta)

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Pythagorean Theorem

A^2 + B^2 = C^2

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Determination of direction from component vectors

(theta) = tan^-1 Y/X

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Dot Product

|A|*|B|cos(theta)

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Cross Product

|A|*|B|sin(theta)

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Average Velocity

v = (delta)x/(delta)t

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Universal gravitational Equation

F = Gm.1m.2/r^2

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Static Friction

0 <= f.s <= (mu.s)N

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Kinetic Friction

f.k = (mu.k)N

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Newton’s First Law

F.net = ma = 0

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Newton’s Second Law

F.net = ma

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Newton’s Third Law

F.AB = -F.BA

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Kinematics (no displacement)

v = v.0 + at

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Kinematics (no final velocity)

x = v.0t + at^2 / 2

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Kinematics (no time)

v^2 = v^2.0 + 2ax

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Kinematics (no acceleration)

x = v.average * t

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Component of Gravity on Inclined Plane

F.g.parallel = mg * sin(theta)
F.g.perpindicular = mg * cos(theta)

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Centripetal Force

F.c = mv^2 / r

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Torque

T = r X F = rF*sin(theta)

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Kinetic Energy

K = 1/2 mv^2

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Gravitational Potential Energy

U = mgh

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Elastic Potential Energy

U = 1/2 kx^2

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Total Mechanical Energy

E = U + K

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Conservation of mechanical Energy

(delta)E = (delta)U + (delta)K = 0

Work done by nonconservative Forces

W.nonconservative = (delta)E

Definition of Work (mechanical)

W = F (dot) d = Fd cos(theta)

Definition of Work (isobaric gas-piston)

W = P (delta)V

Definition of power

P = W/t

Work-Energy Theorem

W.net = (delta)K

Mechanical Advantage

F.out/F.in

Efficiency

W.out/W.in

Fahrenheit to Celsius

F = 9/5 C + 32

Celsius to Kelvin

K = C + 273

Thermal Expansion Equation

(delta)L = (alpha) * L * (delta)T

Volume Expansion Equation

(delta)V = (beta) * V * (delta)T

First Law of Thermodynamics

(delta)U = Q - W

Heat gained of lost with temp change

q = mc (delta)T

Heat gained of lost (phase change)

q = mL

Entropy and heat

(delta)S - Q.rev/T

Second Law of Thermodynamics

(delta)S.universe = (delta)S.system + (delta)S.surroundings > 0

Density

(rho) = m/V

Weight of Volume of Fluid

F.g = (rho) * Vg

Specific Gravity

SG = (rho) / (1 g/cm^3)

Pressure

P = F/A

Absolute Pressure

P = P.0 + pgz

Gauge Pressure

P.gauge = P- P.atm = (P.o + pgz) - P.atm

Pascal's principle

P = F.1/A.1 = F.2/A.2 F.2 - F.1 (A.2/A.1)

Buoyant force

F.bouy = (rho).fluid * V.fluiddisplaced * g = (rho).fluid * V.submerged * g

Poiseuille's Law

Q = (pi) * r^4 (delta)P / (8*(eta)*L)

Critical speed

V.c = N.R * (eta) / ((rho) * D)

Continuity Equation

Q = v.1 * A.1 = V.2 * A.2

Bernoulli's Equation

P.1 + 1/2 (rho) * v.1^2 + (rho)*g*h.1 = P.2 + 1/2 (rho) * v.2^2 + (rho)*g*h.2

Coulomb's Law

F.e = k*q.1*q.2 / r^2

Electric field

E = F.e / q = kQ / r^2

Electric Potential Energy

U = kQq / r

Electric Potential (from electric Potential Energy)

V = U/q

Electric Potential (from source charge)

V = kQ/r

Voltage

(delta)V = W.ab / q

Electric Potential near dipole

V = kqd / r^2 * cos(theta)

Dipole Moment

p = qd

Electric field on perpendicular bisector of dipole

E = 1 / (4*(pi)*(epsilon).0) x p / r^3

Torque on dipole in electric field

T = pE sin(theta)

Magnetic field form straight wire

B = (mu).0 * I / (2*(pi)*r)

Magnetic field from wire loop

B = (mu.0) * I / (2r)

Magnetic force on moving point charge

F.B = qvB sin(theta)

Magnetic force on current-carrying wire

F.B = ILB sin(theta)

Current

I = Q / (delta)t

Kirchoff's junction rule

I.intojunction = I.leavingjunction

Kirchhoff's loop rule

V.source = V.drop

Definition of resistance

R = (rho)*L / A

Ohm's law

V = IR

Voltage and cell emf

V - E.cell - ir.int

Definition of Power

P = W/t

Electric Power

P = IV = I^2 *R = V^2 / R

Voltage drop across circuit elements (series)

V.s = V.1 + V.2 + ... + V.n

Voltage drop across circuit elements (parallel)

V.p = V.1 = V.2 = ... = V.n

Equivalent resistance (series)

R.s = R.1 + R.2 + ... + R.n

Equivalent resistance (parallel)

1/R.p = 1/R.1 + 1/R.2 + ... + 1/R.n

Def'n of Capacitance

C = Q/V

Capacitance based on parallel plate geometry

C = (epsilon).0 * (A/d)

Electric field in a capacitor

E = V/d

Potential Energy of Capacitor

U = 1/2 C * V^2

Capacitance with dielectric material

C' = (kappa)*C

Equivalent Capacitance (series)

1/C.s = 1/C.1 + 1/C.2 + ... + 1/C.n

Equivalent Capacitance (parallel)

C.p = C.1 + C.2 + ... + C.n

Concentration of Solution post dilution

M.i*V.i = M.f*V.f

Boiling Point Elevation

delta.T.b = i*K.b*m

Osmotic Pressure

II = iMRT

Physics Formulas Flashcards

(90 cards)