Question

At what height do you have to push on a solid sphere on a frictionless plain so that it rolls without slipping?

Answer 1

The answer is 2R/5 above the center

Answer 2

That isn't my actual question

Answer 3

My question is, why is it that the answer that you calculate from the equation τ = Iα varies if you change reference frames.

Answer 4

The question is difficult to understand and your latest comment does not add to its legibility. I do not understand what reference frames other than that of the plane could be considered.

Can you give us the full text and picture of the problem, please?

Answer 5

With the constraint that a = αr, and the condition that µ = 0. .