dear professor Hwang,

i have  re created this from your version.

i have added some codes to make it more friendly, corrected some physics etc.

enjoy! and thank you for teaching me so much from your Forum!

http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/04-turning-effects-of-forces/362-blocktiltedwee