Physics units/ conversions

various units and some conversions as well as a couple formulas

Coulomb’s constant

k=8.99×10^9 N*m²/C²

Coulomb’s law

F=kq1q2/r²

current (i) unit:

amperes (A)

Charge (q)

Coulombs (C)

Ampere

C/s

Electric Field (E) units:

N/C

V/m

Electric Field (E) formulas:

E=F/q

V=Er

E=kq/r²

Electric potential energy (U) unit:

Joules (J)

Electric potential energy (U) formula:

U=qV

Volt/ potential difference (V) unit:

J/C

Volt/ potential difference (V) formulas:

Delta V=Vf-Vi

V=kq/r

Resistance (ohms) unit:

V/A

Ohm’s law

R=V/i

V=iR

Total resistance in a parallel circuit

1/Rnet=1/R1+1/R2…

R1*R2/R1+R2 (Product over sum)

Total resistance in a series circuit

Rnet=R1+R2

Electric flux unit:

N*m²/C

Electric flux formula:

Delta electric flux=E*Delta A (area)

Mechanical to thermal energy (resistive dissapation) formulas (where P=Power):

P=i²R

P=V²/R

H atomic radius

5.3×10^-11 m

escape speed

v=sqrt of 2Gm/r

mechanical energy (elliptical orbit)

E=-GMm/2r

orbital velocity

sqrt of Gm/r

constant torque

P=Torque*Angular velocity

angular momentum

L=Torque*time

Simple Pendulum

T=2pi*sqrt of L/g

Hooke’s law

F=kx

Mechanical energy-simple harmonic motion

½ kx²

period in context of hooke’s law

T=2pi*sqrt of m/k

angular velocity (Hooke’s law)

w=sqrt of m/k

Wave speed

V=lambda*frequency

wavelength

L=n*lambda/2

frequency of waves

w/2pi OR v/lambda

General for inertia

1/2Mr²