Your answers are pretty much correct.
Q5 correct, the force is spread over a larger area therefor decreasing the pressure.
Q3 magnets have 2 poles, a 'south pole' and a 'north pole'. The magnetic filed lines flow from the north pole to the south pole.
From Wikipedia:
http://en.wikipedia.org/wiki/MagnetPole naming conventions
The north pole of a magnet is the pole that, when the magnet is freely suspended, points towards the Earth's North Magnetic Pole in northern Canada. Since opposite poles (north and south) attract, the Earth's "North Magnetic Pole" is thus actually the south pole of the Earth's magnetic field.[8][9][10][11] As a practical matter, in order to tell which pole of a magnet is north and which is south, it is not necessary to use the Earth's magnetic field at all. For example, one method would be to compare it to an electromagnet, whose poles can be identified by the right-hand rule. The magnetic field lines of a magnet are considered by convention to emerge from the magnet's north pole and reenter at the south pole.[11]
