Hello This is a question from the recent national exams in Physics in Greece: Two equal sized coins (1 euro) are placed on one edge of a frictionless flat table. Coin "A" has a continuous force F applied at it's centre and pointing to the opposite edge of the table. Coin "A", as a result, moves and takes a time Ta to reach the other edge. Coin "B" has a continuous force of the same magnitude, F, applied at it's rim, tangentially and also pointing to the opposite edge. Will coin "B" get there (a) faster , (b) slower (c) at the same time ? You can have a look at the free-body diagram at http://www.cosmicway.net/freebody.gif Although I suspect the answer is (c), my dynamics are a little rusty. Very few students gave the answer and the political left are "up in arms" because this question (and some others) were too difficult.