Scratch

I am a teacher and I am doing my notes on forces and need 4 animations ... (please keep in mind this is NOT my example - the kids came up with it...)  a stickman running up and "kicking" a small sitting stick-kid(they actually said "baby" but I think small kid is ok)  showing FAST acceleration, a stickman running up and "kicking" a Fat sitting stick-kid showing SLOWER accelreation, a stickman running up and "kicking" a small sitting stick-kid with "less" force showing less acceleration ,a stickman running up and "kicking" a small sitting stick-kid with "more" force showing more acceleration. 
It may seem morbid but the kids remember it! and if they could see it...

Thanks in advance!