ejemplo.lua

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--
-- main.lua
--
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-- Your code here

local fisica = require('physics');
fisica.start();

local back = display.newImage('bkg_clouds.png');

back.x = display.contentCenterX
back.y = display.contentCenterY

local base = display.newImage( 'ground.png', display.contentCenterX, 445 );	

fisica.addBody(base, 'static', {friction = 0.5, bounce=0.3});

-- friction = Fr = uN     u=constante de proporcionalidad
-- u = Fe/N 
-- u = Fd/N


local caja = display.newImage( 'crate.png', 100, 50 );

fisica.addBody(caja, {density=3.0, friction=0.5, bounce = 0.3});

-- densidad = m/V      
-- =magnitud       
-- masa/Volumen
-- 	Kg/m3

local caja2 = display.newImage( 'crate.png', 120, 120);
fisica.addBody(caja2, {density=3.0, friction=0.5, bounce=0.3})
-- fisica.addBody(caja2, {density=30.0, friction=0.5, bounce=0.3})