Cevap :
http://www.bestoffrm.com/140735-basit-makinelerkaldiraclarmakaralarpalangalaregik-duzlemcikrikvidalar.html
http://fizikodevleri.blogcu.com/makaralar-palangalar/5132966
http://odevistan.blogcu.com/7-sinif-fen-ve-teknoloji-basit-makineler-konu-anlatimi/4514577