# Physics Formulas for CBSE Class X | Formulae 2012

## Physics formulas for high school

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
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

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• It is said that the speed of light decreases when it passes from a optically rarer medium into a optically denser medium. Then the speed of light again increases when it emerges out of the medium.From where does the light particles get the required energy to accelerate its speed when it emerges out of the optically denser medium into a optically rarer medium.

mal san on 27 Mar 2013
• i want full formula of chemistry i am studing in standard 10 . and i want imp of maths for board exam.

poo on 02 Dec 2012
• on what factors does the resistance of a conductor depend on it s based on electricity
???????

hemna on 10 Sep 2012
• pls give more formulas of 10 standard with full explanation of formulas

chandan on 05 Sep 2012
• The formulas given here are good and useful but I need more formulas related to optics.
By the way I’m gulminha

jasminekhan on 27 Jul 2012
• Is it possible to see the electronic configuration of any element through an electron microscope.( I mean can we see the electrom moving in the shells.

S.Banerjee on 16 Apr 2012
• Hi i am md ali raza.can you explain how we can solve numericals problem easily.

md ali raza on 03 Apr 2012
• The formulas given here are good and useful but I need more formulas related to optics.
By the way I’m Mrinal.

Mrinal Bhadra on 21 Mar 2012
• An electric kettle is rated 500W, 220W. It is used to heat 400 g of water for 30 seconds. Assuming the voltage to be 220V, Calculate the rise in the temperature of the water. Specific heat capacity of water = 4200 J/kg deg

rakes on 07 Jan 2012
• you have many magnesium ribbon which burns ununiformly.
the whole ribbons burns in 60 minutes.
how much length or percentage of ribbon will in 30 minutes?.

rakesh on 07 Jan 2012
• v=10
u=5
a=?
t=10
v=u+at
10=5+a.10 is ka answer 0.5 to ye kaise aaya…

manisha on 08 Oct 2011
• Can anyone make Physics interesting?
ahhhhhhhhhhhhh……………
bored

Aakash Sinha on 26 Sep 2011
• @dhwanil with the help of mass spectrometer they bombard the neutrons so tht there will be fusion occuring due to which the hydrogen will be helium!!!

sid on 08 Aug 2011
• An electric kettle is rated 500W, 220W. It is used to heat 400 g of water for 30 seconds. Assuming the voltage to be 220V, Calculate the rise in the temperature of the water. Specific heat capacity of water = 4200 J/kg degree celcius.

Srishti Patel on 19 Jul 2011
• usha swimmings in a 90 meters long pool. she covers 180 meters in 1 minute by swimming from one end to the other and back along the same straight path find the average speed

u. meghana on 06 Jun 2011
• How to learn physics ? how keep in mind the formule and solve questions

Akanksha on 14 Apr 2011
• you have many magnesium ribbions which burns in 60 minute each ununiformly.how much length or percentage of each ribbon will burn in 30 minutes

bhupesh on 11 Apr 2011
• you have many magnesium ribbon which burns ununiformly.
the whole ribbons burns in 60 minutes.
how much length or percentage of ribbon will in 30 minutes?.

bhupesh on 11 Apr 2011
• if helium is made from hydrogen fusion,how is neutron made?because there are no neutrons in hydrogen

dhwanil on 07 Apr 2011
• how can i solve numeical problems relating to light of class X physics?

Azizur Rahman on 29 Mar 2011
• An object 3cm high is placed perpendicular to the principal axis of cancave lens of focal length 7.5cm
the image is formed at the distance of 5cm from
the lens. tell the nature of the object?

NITIN on 26 Feb 2011
• a heavier body and a lighter body are moving with the same velocity.explain which of them can do more work????

shristi shahi on 06 Jan 2011
• Hi i am aravind. Can you explain about the transfer of current(flow of electrons) ie.between a positive terminal to a negative terminal,for instance,how does the electron originate from the positive terminal and go towards the negative terminal..?? Why is it(electron-a negative charged particle) attracted towards a negative terminal..?? Usually similar charges repel… I still dont understand it… Pl can you explain….
Thank you.

M.S.ARAVIND on 15 Dec 2010