Algodoo

Physics involved (yeah no kidding...)
You can detach dem springs so you can move them around.


C̪͕̤̜̎͌́͛ͥ̂͗͜_̨̢͉̂ͧ̀̔͛ͯͩͨ̕-
̩̲̲̱̹̦̮r̦̥͉̖͉͖͆͑̋ͥ͡e͉̟̪̾̓ͮ́̆͒́͢-
̹̪̼̗͇ ̵̡̮͚̯̯̝̖̑̔͐̇̓̅̋͢f̷̹̬̻͔̏̽͂ͨ̐̍̊̕�-
�̤̲r̶̭̖ͭ̑͗̂ͭ̈́͜ ̶̛͗ͫ̂̀ͨ͊̑ͦ͏̻͍̬̻̠G̸̩̥̪̹ͮ̿̈́͆ͥ̅̚͡�-
�̙̮̠d̙̱̩̱̞̉͆ͧ́.̷̤̬̬͎̣̙͊ͨ́ͬ̉̾ͮ̾̔.-
̡̺͙̲̩̯̦̭͎̃̏̊ͣ͞e̸̟̜̜͈͊ͥņ̄̔ͮ̇ͤ̎̀-
͢҉̩͈̭̘͕̱ ̻͔͙̦̲̦ͪͯ̋͆́̃̃͜͡F͓̱̲̖̾ͫͤ̎̄͗́̚͜͞�-
�͙̝ṛ̺̗̲̳͙̭͍̆̇̆ͧ̓̚̕͝͡ͅdͦ̂̈ͭ̈̿̏͜�-
�̳̱͢.̶̭̱͓̭͕ͩ͛̓.̵̡̝ͤ̊̈́.̶̶͚̫̻̗̌̿̓͋-
e̡̘̜̺̼̖̍̂̕.̐͗͏̪͖̖̼̮.̶̶̮̇̃ͪ̉ͭ̚͠ͅ�-
�̼̳̥̯y̸̷̸̳͉̤̬͖̦ͫ͑̌̾