Scratch

A lot of people wonder how to make gravity there are a number of ways to do it but I think this way works the best.

Step1: make a variable you can name it what ever you wont but I am going to name it (y)
Step2: make a script like this   (<when green flag clicked> <forever <change y by <(y)>>>)
Step3: make a script like this one (<when green flag clicked > <forever <wait until <touching colour {the colour of  your ground} < set (y) to 0 >)
Step4: make a script like this one ( <when green flag clicked> <set (y) to 0> <forever <wait until <not touching {the colour of your ground} <change (y) -1 <wait 0.5 seconds>
check out my gravity mini game for line os (scratch mini game)
http://scratch.mit.edu/projects/jurk/1930841  but first you half to download it and line os from slinger then flow thees steps

to add this to line os by slinger save this then go to line os press fial then press the one that says  import prodject... press it find this prodject and importe it to line os go to the apps in line os you should find scratches head press it and use the arrow keys to move

pleas look at my prodjects 
orrigami : http://scratch.mit.edu/projects/jurk/1928831
orrigami part 2 : http://scratch.mit.edu/projects/jurk/1928836
origami bird : http://scratch.mit.edu/projects/jurk/1930677
comming soon origami : http://scratch.mit.edu/projects/jurk/1930697
origami magic star Frisbee : http://scratch.mit.edu/projects/jurk/1930762
origami magic star Frisbee 1: http://scratch.mit.edu/projects/jurk/1930763
boxing game : http://scratch.mit.edu/projects/jurk/1887772
space master ep1 : http://scratch.mit.edu/projects/jurk/952570
space master ep2 : http://scratch.mit.edu/projects/jurk/1874995
space master ep3 : http://scratch.mit.edu/projects/jurk/1892308
3d guy : http://scratch.mit.edu/projects/jurk/1927509
3d sword : http://scratch.mit.edu/projects/jurk/1928699
3d thing : http://scratch.mit.edu/projects/jurk/1927288
3d love it for more and to be advertized : http://scratch.mit.edu/projects/jurk/1927653
My O.S. sds : http://scratch.mit.edu/projects/jurk/1928638
illision : http://scratch.mit.edu/projects/jurk/1927175
illision 2 : http://scratch.mit.edu/projects/jurk/1927352
marquee : http://scratch.mit.edu/projects/jurk/1925696
ticTacToe-V4 {2} : http://scratch.mit.edu/projects/jurk/1918826
1st player brawl mesh 1.0 : http://scratch.mit.edu/projects/jurk/1912045
2nd player brawl mesh 1.0 : http://scratch.mit.edu/projects/jurk/1912054