excessive amounts of air,loose washer in faucet,small debris or gravel in piping system.
water/friction
if the pipes are warm or hot at the time the coldwater passes though them, it can cause the pipes to cool and contract
choir members in your pipes
Water freezes at 0 deg C. As the water freezes in the pipes, it expands and it is the force of expansion which causes the pipes to burst.
some times when temperatures go really cold in winters it causes water to freeze and as the water in pipes starts to freeze, the expansion that takes place when water freezes causes pipes to break
Depending where the noise was coming from, but this question is most likely to be answered in this way. If you switched a valve off and the noise was coming before the valve in the pipes, that would indicate a burst pipe.
Firstly the noise is caused by rattling pipes which havent been secured down properly. secondly having low pressure after a while would indicate either air in the lines or your water pipes have started to clog up somewhere
Usually dissolved calcium is the cause of scaling in pipes that carry water.
Singing water pipes can be caused by air that is trapped in the pipes. The air can cause a whistling or singing sound, or it can cause the pipes to knock or rattle.
Much of the time it is because of well water and the "hard" qualities of well water such as rust / lime etc... Sometimes turning on the hot water first and letting it run through pipes then turning it off and turning the cold water on helps. If that doesn't work, you may need to clean or replace the pipes, depending on how old they are.
Decrease pressure to prevent excessive velocity
Expansion and contraction