# Useful equations

Flashcards by f.conboy1, updated more than 1 year ago
 Created by f.conboy1 over 7 years ago
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1

### Description

A-Level Physics Flashcards on Useful equations, created by f.conboy1 on 09/30/2013.

## Resource summary

 Question Answer Force Force=mass x acceleration F=ma Density Density= mass÷volume ρ=m÷v Speed Average speed= distance÷time Acceleration Acceleration= change in velocity÷time A= (v-u)÷t Weight Weight= mass x gravity w= mg Moment around a point Moment= force x distance from point m= fd Spring Load= spring constant x extension F= kx Pressure Pressure= force÷area P= f÷a Pressure (liquid) Pressure= density x gravity x depth P=ρgd Temperature (Kelvin) Temperature Kelvin= Temperature Celcius + 273 Gases Pressure (1) x Volume (1)÷ Temperature (1)= Pressure (2) x Volume (2)÷ Temperature (2) Work Work = Force x distance moved w= fd Work Work = Force x distance moved w= fd Gravitational potential GP= mass x gravity x height GP= mgh Kinetic energy KE= half x mass x velocity^2 KE= 1/2mv^2 Specific heat capacity Energy transferred= mass x specific heat capacity x temp change E= mcΔt Latent heat Energy transfered= mass x latent heat E= mL Power Power= work ÷ time= energy transferred ÷ time p= w÷t Efficiency Efficiency= work done ÷ input= energy output ÷ input= power output ÷ input Wavespeed Speed= frequency x wavelength v= fλ Period Frequency= 1 ÷ period f= 1÷t Refraction Refractive index= sin angle of incidence÷ sin angle of reflection n= sin(i)÷sin(r) Internal reflection Sin critical angle= 1÷reflective index sin c= 1÷n

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