LÖVE

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  --let's create a ball
  bodies[1] = love.physics.newBody(world, 650/2, 650/2, 15, 0) --place the body in the center of the world, with a mass of 15
  shapes[1] = love.physics.newCircleShape(bodies[1], 0, 0, 20) --the ball has a radius of 20

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function love.load()
  world = love.physics.newWorld(-650, -650, 650, 650) --create a world for the bodies to exist in with width and height of 650
  world:setGravity(0, 700) --the x component of the gravity will be 0, and the y component of the gravity will be 700
  world:setMeter(64) --the height of a meter in this world will be 64px
  
  bodies = {} --create tables for the bodies and shapes so that the garbage collector doesn't delete them
  shapes = {}
  
  --let's create the ground
  --we need to give the ground a mass of zero so that the ground wont move
  bodies[0] = love.physics.newBody(world, 650/2, 625, 0, 0) --remember, the body anchors from the center of the shape
  shapes[0] = love.physics.newRectangleShape(bodies[0], 0, 0, 650, 50, 0) --anchor the shape to the body, and make it a width of 650 and a height of 50
  
  --let's create a ball
  bodies[1] = love.physics.newBody(world, 650/2, 650/2, 15, 0) --place the body in the center of the world, with a mass of 15
  shapes[1] = love.physics.newCircleShape(bodies[1], 0, 0, 20) --the ball has a radius of 20

  --initial graphics setup
  love.graphics.setBackgroundColor(104, 136, 248) --set the background color to a nice blue
  love.graphics.setMode(650, 650, false, true, 0) --set the window dimensions to 650 by 650
end


function love.update(dt)
  world:update(dt) --this puts the world into motion
  
  --here we are going to create some keyboard events
  if love.keyboard.isDown("right") then --press the right arrow key to push the ball to the right
    bodies[1]:applyForce(400, 0)
  elseif love.keyboard.isDown("left") then --press the left arrow key to push the ball to the left
    bodies[1]:applyForce(-400, 0)
  elseif love.keyboard.isDown("up") then --press the up arrow key to set the ball in the air
    bodies[1]:setY(650/2)
  end
end

function love.draw()
  local x1, y1, x2, y2, x3, y3, x4, y4 = shapes[0]:getBoundingBox() --get the x,y coordinates of all 4 corners of the box.
  --x1, y1 represent the bottom left corner of the bounding box
  --x2, y2 represent the top left corner of the bounding box
  --x3, y3 represent the top right corner of the bounding box
  --x4, y4 represent the top right corner of the boudning box
  local boxwidth = x3 - x2 --calculate the width of the box
  local boxheight = y2 - y1 --calculate the height of the box
  love.graphics.setColor(72, 160, 14) --set the drawing color to green for the ground
  --the rectangle is drawing from the top left corner
  --so we need to compensate for that
  love.graphics.rectangle("fill", bodies[0]:getX() - boxwidth/2, bodies[0]:getY() - boxheight/2, boxwidth, boxheight)
  love.graphics.setColor(193, 47, 14) --set the drawing color to red for the ball
  --the circle is drawing from the center
  --so we do not need to compensate
  love.graphics.circle("fill", bodies[1]:getX(), bodies[1]:getY(), shapes[1]:getRadius(), 20)
end

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shapes[1]:setRestitution(0.3);

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function love.update(dt)
    dt = math.min(dt, 1 / 30)
    ...
end