All formulas of science class 9

In this post, we are going to learn all formulas of science class 9 in which all formulas of all chapters have been given.

Students of class 9 must learn these science formulas so that they can easily solve numerical questions asked in the examination.

The following Chapters consist of formulas for numerical questions.

   1.  Formulas of Chemistry class 9 Chapter 1

   2.  Formulas of Chemistry class 9 Chapter 2

   3.  Formulas of Chemistry class 9 Chapter 3

   4.  Formulas of Chemistry class 9 \Chapter 4

   5.  Formulas of Physics class 9 Chapter 8

   6.  Formulas of  Physicsclass 9 Chapter 9

   7.  Formulas of Physics class 9 Chapter 10

   8. Formulas of Physics class 9 Chapter 11

   9. Formulas of Physics class 9 Chapter 12

 

Formulas of Chemistry Class 9 Chapter 1

Numerical questions on interchange units of temperature. There are mainly Celsius scale, Kelvin scale, and Fahrenheit scale are used to measure temperature.

i). Relation between Celsius scale and Kelvin scale

      `T(K)= t (℃) + 273`

      

ii). Relation between Fahrenheit scale and Celsius scale

       `℉= 9/5 (℃) + 32`

Formulas of Chemistry Class 9 Chapter 2

In this chapter Is Matter Around Us Pure, numerical questions on calculating the concentration of solutions/substances are asked in the examination. Following are the formulas of chapter 2 class 9 science

   1.  Mass by mass percentage

   2.  Mass by volume percentage

   3.  Volume by volume percentage

   4.  Concentration in parts per million(PPM)

        

     

 Formulas of Chemistry Class 9 Chapter 4

 

(i) Atomic number =  number of protons = number of electrons

(ii)   A   =      Z+ n

Mass number=(A)

Number of protons=(Z)

Number of neutrons=(n)

Formulas of Physics Class 9 Chapter 8

(i)     `v=\frac{s}{t}`

 

v= Average speed (m/s)

s= Total distance traveled (m)

t= total time taken (s)

 (ii)    `v_{av}=\ \frac{u\ +\ \ v}{2}`

 

`v_(av)` =  average velocity(m/s)

  u = initial velocity(m/s)

  v = final velocity (m/s)

  (iii)  `a\ =\ \frac{v-\ u}{t}`

a=acceleration (`ms^-2`)

v= final velocity (m/s)

u= initial velocity (m/s)

t= time taken (s)

(change in velocity = final velocity – initial velocity)

(iv)   Three equations of motion

(a)  `v=\ u\ +at`

(b)   `s=\ ut\ +\ \frac{1}{2}at^2`

(c)    `2as\ =\ v^2\ -\ u^2`

(v) Motion in the circular path

     `v=\ \frac{2\pir}{t}`

 Formulas of Physics Class 9 Chapter 9

(i)  `\ P=\ mv`

P= Momentum (`Kg ms^-1`)

m =  mass (Kg)

v = velocity  (`ms^-1`)

(ii) Rate of change of momentum= `\frac{m\times(v-u)}{t}`

v= final velocity (m/s)

u=  initial velocity (m/s)

(iii) `F=ma` 

F= force  (`Kgms^-2`)  or Newton

m=mass (`Kg`)

a= acceleration (`ms^-2`) 

Formulas of Physics Class 9 Chapter 10

 (i) Universal law of gravitation

      `F=G\ \frac{M\ m}{d^2}`

F = Force (N)

G = universal gravitation constant = `6.673 × 10^-11 N m^2 kg^-2`.

M= mass of body A(Kg)

m =mass of body B(Kg)

d= distance between body A and B (m)

(ii).  `G=\frac{Fd^2}{M\timesm}` (`N m^2 kg^-2`)

(iii)  Calculation of g (gravitational acceleration)

                  `g=\ G\frac{M}{d^2}`

              

           g   = gravitational acceleration (`ms^-2`)

           G = universal gravitation constant = `6.673 × 10^-11 N m2 kg–2`

           M =  mass of the earth (Kg)

           d = distance between earth and object (`m^2`)

            (iv)  Gravitational acceleration near the surface 

             `g=\ G\frac{M}{R^2}`

     

           R =  Radius of the earth(`m^2`)

            [  F = ma  ]

            [  F = mg  ]

           (v) Weight of an object on the moon

 

             `W_m=\frac{1}{6}\timesW_e`

 

            `W_m` = weight on the moon(`Kgms^-2`) or (N)

            `W_e` =  weight on the earth(`Kgms^-2`)  or (N)

            (vi)    `Pressure=\ \frac{Thrust}{Area}` 

             P =  Pressure (`Nm^-2`)

             F=Thrust (`N`)

             A= Area(`m^2`) 

              (vii) `Relative\ density = \frac{\text (density of   a substance)}{\text (density  of  water)}`

            Formulas of Physics Class 9 Chapter 11

            (i)   W=Fs

        

          W= work done (Nm)   or (J)

           F= Force (N)

           s = displacement (m)

 (ii) `W=F\ s\ cos\theta`

            (iii)  `E_k=\frac{1}{2}mv^2`

            `E_k` = Kinetic energy(J)

            m= mass (Kg)

            v =velocity (`ms^-1`)

           (iv) `W=mgh`

           W = Potential energy (J)

           m= mass  

            g = gravitation acceleration (`9.8 ms^-2`)

           h = height/displacement (m)

           (v) `P=\frac{W}{t}`

            P = power (Joule/s )  or (Watt)

           W = work(J)

           t = time (s) 

            (vi)  Energy consumed

                   `=\frac{Power\times\ time}{1000}` (KWh or Unit)

            Formulas of Physics Class 9 Chapter 12

            (i)  `v=\ \frac{1}{T}`

              v= Frequency (Hertz)

              T= Time period(s)

            (ii) `v=\frac{\lambda}{T}`

               `v = speed (ms^-1)`

              `\lambda` = wave length(m)

                T= time period (s)

              (iii)    `v=\ \lambda\upsilon`

                 v= speed (m/s)

                `\upsilon` = wavelength (m)

                `\lambda` = wave length(m) 

                    

                Related Topics

    1. Physical Properties of Metals

    2. Preparation of Baking Soda

3. Preparation of Washing  Soda

4. Preparation of Sodium hydroxide

5. What happens during a chemical reaction

            So, these are all formulas of science class 9, If you have any doubts, then ask questions in  'HELP Desk'