# PHYSICS NOTES AND FORMULAS

Jun 17th, 2015
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Density is mass per unit volume Density = mass / volume. Force = rate of change of momentum. 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

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Density is mass per unit volumeDensity = mass / volumevelocity = displacement / timeForce = rate of change of momentumMomentum = mass.velocityPower is rate of work donePower = work / timeUnit of power is wattPotential energy (P)PE = m.g.hm = massg = acceleration due to gravity (9.81m/s2)h = heightKinetic energy (P)P = (1/2).m.v2m = massv = velocityGravity (Force due to gravity)Fg: Force of attractionG : Gravitational constantM1: Mass of first objectM2: Mass of second objectAcceleration due to gravity at a depth 'd' from earth surface is :Acceleration due to gravity at height 'h' from earth surface is :h is very much smaller than REscape velocityEscape velocityfroma body of mass M and radius r isFor example if you want to calculate the escape verlocity of sa object from earth then,M is dmass of earthr is radius of earthOPTICSIndex of refractionn = c/vn - index of refractionc - velocity of light in a vacuumv - velocity of light in the given materialUnder constant acceleration linear motionv = final velocityu = intitial velocitya = accelerationt = time taken to reach velocity v from us = displacementv = u + a ts = ut + (1/2)a t2s = vt - (1/2)a t2v2= u2+ 2 a sFriction force (kinetic friction)When the object is moving then Friction is defined as :Ff= FnwhereFf= Friction force, = cofficient of

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