1. The problem statement, all variables and given/known data Calculate the centripetal force required to rotate a 3Kg object in a circle at a radius of 3m at one revolution per second? Ok for some reason i find circular motion a real struggle i have come up with an answer for this question but looking for some reassurance i am on the right lines. 2. Relevant equations Fc = MV2/r V = 2[itex]\pi[/itex]r/t 3. The attempt at a solution First i need to work out the velocity so i use V = 2[itex]\pi[/itex]r/t V = (2[itex]\pi[/itex] x 3)/1 V = 18.85 m/s1 With this i then used the Fc = MV2/r equation to work out the centripetal force as below. Fc = (3 x 18.852)/3 Fc = 355.32 N As i said at the beginning of this post i lack confidence in circular motion so would appreciate a pointer in the right direction if i have gone astray.