.Solving the Physics of a Seesaw Catapult

[whozum]

is it rolling or sliding..
if its sliding then friction is neglible and your acceleration is just g*sin(t)

 

[Milchstrabe]

can't we make a similar assumption if it's a marble (I know that it really isn't the same since the object is rolling, and gravity has an effect on how the ball spins and therefore changes the acceleration). However we never did it this way since it is high school physics after all. So i don't know if he wants me to go too deep with the whole rolling thing. Unless you can explain it fairly simply?