37. Centripetal Force  

Is the force that holds a can whirled overhead at the end of a string an outward-acting or inward-acting force — and why?

End Question:

If instead of whirling a can through the air by a string, suppose we whirled it in a circular path on a horizontal friction-free lab table, in such a way that the string remains horizontal. Would the string tension alone, without vector components, be the centripetal force?