Physics Formulas

Question 0

Electric field

Answer 0

E= k q1/r^2

Unit is N/C or V/m

Question 1

Coulomb’s law

(To find magnitude of force of repulsion or attraction

Answer 1

F=k q1q2 / r^2

K= 9*10^9

Question 2

Electric potential

Answer 2

U = k q1q2 / r

Unit is joules

Question 3

Voltage due to a point charge

Answer 3

V = k q1/ r

Question 4

Voltage in terms of resistance and current

Answer 4

V= I R

Question 5

Charge in terms of capacitance and voltage

Answer 5

C = q / v

Question 6

Power in terms of current and voltage and resistance

Answer 6

P= I V

P= I ^2 R

P= V ^2/ R

Question 7

Magnetism:

Force in terms of charge and magnetic field

Answer 7

F= q V cross B

Question 8

Formulas at constant acceleration

Answer 8

X= Xo + Vot + 1/2 at

V= Vo + at

V^2= Vo^2 + 2ax

V= square root 2gh (Vo must be zero)

Question 9

Newtons Second law

Answer 9

F = na

Question 10

Formulas pertaining to waves

Answer 10

V = f * wavelength
(Velocity= frequency * wavelength)

F= 1 / T

Question 11

Kinetic energy of a beta particle

Answer 11

MV^2 / 2

Question 12

To find E of a photon from its wavelength

Answer 12

E= hc/ wavelength

H is plancks constant
C is the velocity of electromagnetic radiation

Question 13

Frictional force

Answer 13

Force * distance

Question 14

Inelastic collision

Answer 14

The two stick together and have one final velocity

Vfinal = Vinitial * (Minitial / Mfinal)

Question 15

Coefficient of friction

Answer 15

Frictional force / normal force

Normal force is mass multiplied by gravity

Question 16

How to find time at constant acceleration

Answer 16

T = (2h/g) ^1/2

Question 17

How to find horizontal distance at constant acceleration

Answer 17

D = vt

Question 18

Buoyant force

Answer 18

Density * volume of object * gravity