This document provides physics formulae for density, velocity, force, momentum, power, kinetic energy, potential energy, Ohm's law, index of refraction, and equations for acceleration due to gravity at different heights and depths from Earth's surface, as well as escape velocity. Key equations include: Density = mass / volume, Velocity = displacement / time, Force = rate of change of momentum, Power = work / time, Kinetic energy = (1/2)mv^2, Potential energy = mgh, Ohm's law = V=IR, Index of refraction = c/v.

1. PHYSICS FORMULAE
Density is mass per unit volume
Density = mass / volume
velocity = displacement / time
Force = rate of change of momentum
Momentum = mass . velocity
Power is rate of work done
Power = work / time
Unit of power is watt
Potential energy (P)
PE = m.g.h
m = mass
g = acceleration due to gravity (9.81m/s2)
h = height
Kinetic energy (P)
P = (1/2).m.v2
m = mass
v = velocity
Ohm's law
V=I.R

2. V = voltage applied
R = Resistance
I = current
Electric power (P) = (voltage applied) x (current)
P = V . I = I2 . R
V = voltage applied
R = Resistance
I = current
OPTICS
Index of refraction
n = c/v
n - index of refraction
c - velocity of light in a vacuum
v - velocity of light in the given material

3. Density is mass per unit volume velocity = displacement / time
Density = mass / volume
Force = rate of change of momentum Momentum = mass . velocity
Power is rate of work done Kinetic energy (P)
Power = work / time P = (1/2).m.v2
Unit of power is watt m = mass
v = velocity
Potential energy (P)
PE = m.g.h
m = mass
g = acceleration due to gravity (9.81m/s2)
h = height
Gravity (Force due to gravity) Acceleration due to gravity at a depth 'd' from earth
Fg : Force of attraction
G : Gravitational constant
M1 : Mass of first object gd = g(1- d
R)
G M1 M2 surface is :
Fg =
r2
M2 : Mass of second object
Acceleration due to gravity at height 'h' from earth Escape velocity
surface is : Escape velocity from a body of mass M and radius r
is
gh = g(1- 2
h )