Recent content by popo

I appreciate you help by the way

Okay now i get you, but just want to be clear that i have the same picture about the train. How does the track looks like? It said horizontally so is that like a circular train on a horizontal flat surface?

is that a special case? because from what i learn for circular motion there would be friction force acting centripetally or centrifugally.

I know we want to find angular acc so we need to use a = rα, which that is tangential acc, but the thing is the train is moving in ciruclar motion so there should only be centripetal forces acting on it which would be the friction.

then my question would go to why we use tangential acc instead of centripetal acc?

Hi, thanks for taking a look! A toy train rolls around a horizontal 1.4-m-diameter track. The coefficient of rolling friction is 0.12. (a) What is the magnitude of the train's angular acceleration after it is released? (b) How long does it take the train to stop if it's released with an...