Equations for Physics iGCSE Co-Ordinated

Equation

Symbols

  



 =   

 = 

  =

   

  

 =

 =   ×     = $  =

 – m/s  – metres (m)  – seconds (s)

∆ 

 =

 

"=

'=

( )

 #

OR ρ=

, = 

 =      × - 

 = ./

0 =  × $  %


1 = 

-ve acceleration means deceleration

(

P – N/m²

A way of comparing the effect of Forces

D – Kg/m³

A way of comparing materials masses

) OR -

%  =  ×   + 


Notes Velocity is a vector (one direction), speed is a scalar only the size matters

This is Newton’s Second Law

 = 

 !

%  & 

Units

g/cm³

M - Nm

All about Turning Forces This equation comes from Hooke’s Law experiments with Springs

W – Joules (J) F – Newtons (N) s – metres (m)

Work is energy used. This is the same as the PE equation. PE is just for things lifted up, not in any direction

1  4 3= 5

P – Watts (W)

Power just means the energy per second J/s

KE – Joule (J)

   7  =   × 
 × 

1 :; =   2 "; = >ℎ

0 =   × 


1@ = >

A  =   × B+ A  C   × D   C 

E = F∆G

2 =

0 $    

++  =

+         

8 6  7  =   ×
9 9

 8 & 8  9 & 9 = D  8 D  9 C   =

C  D

&  =

7  C 

2 = C   × &  N  =

&  C  

8 8 8 = + N   N 8 N 9

"=

It has no units but if you multiply it by 100 you get a % It is always smaller than 1 (or 100%)

PE – Joules (J) W – Newtons (N) M – Kilograms (Kg)

H – Joules (J) C – J/Kg°C ∆G = FℎH>3 5H 3I

"J KJ " K = GJ G

This is energy because of how high you are lifted. Your weight can easily change if Gravity changes. Your mass is harder to change…you need to eat more or chop bits off. Specific Heat Capacity is a way of seeing how hard something is to heat up. Water has a high value of c, so is hard to raise its temperature. Lots of Heat is used. Always put the temperature into Kelvins (+273).

M  ; K= M

I – Amps (A)

An Amp is a Coulomb per Second

V – Volts (V)

A Volt is a Joule per Coulomb

" = LK

P – Watts (W)

This is just another way of calculating the Energy per second

K L

R – Ohms (Ω)

This is Ohms law

Only used for parallel circuits. Series ones you just add up the resistors

Remember to flip the answer upside down to get the Total Resistance. If

Frequency – Hz Wavelength – m

This equation works for any kind of wave

L=

O=

1 1 1 = + O@ OJ O

2
  = +V   × 2
 

 = WX

Y Z + D      &     = &   B  Y Z + D    B 

[\ K\ = [] K]

J QR

=

S J

then O@ = 3U

Just used for Transformers