- #1
brendan3eb
- 54
- 0
This much more of a general question that I've encountered in quite a few problems and I haven't found an answer to in my books or searching the net yet. Take, for example, a ball that has been propelled into motion by a spring gun on the floor. Initially, the ball accelerates so that the ball is in not in smooth rolling motion. I have always assumed that for this first part, before the ball conforms to smooth rolling motion, that the sliding friction force acts in the direction opposite of the displacement of the ball, and I pretty much just treat the ball like a block that is sliding on a floor with friction. Then after determining when the ball begins smooth rolling motion, I imagine that there is a static frictional force acting in the direction of displacement and opposite of the rolling of the ball.
Is this an appropriate way to describe the direction of the frictional force in rolling motion? If so, then it would be appropriate to say that the first frictional force leads to greater angular acceleration, whereas the second frictional force would lead to lesser angular acceleration in accordance to τ=Iα
Is this an appropriate way to describe the direction of the frictional force in rolling motion? If so, then it would be appropriate to say that the first frictional force leads to greater angular acceleration, whereas the second frictional force would lead to lesser angular acceleration in accordance to τ=Iα