Conservation law, also called law of conservation, in physics, several principles that state that certain physical properties (i.e., measurable quantities) do not change in the course of time within an isolated physical system. In classical physics, laws of this type govern energy, momentum, angular momentum, mass, and electric charge.
On New Yearâs Eve, the Metrorail system will open at 7 a.m. with special extended service on all lines until 3 a.m. The additional three hours of service â consistent with past years â is a special exception to a moratorium on extended hours during the year-long SafeTrack maintenance program.
Fair Info. Hours â Admission. Hours â Gates, buildings and midway open at 10:00 a.m. each day, except Tuesday when gates open at 4:00pm. Gates close at 10:00pm on Tuesday through Thursday, Midnight on Friday and Saturday and 8:00pm on Sunday. Admission â Includes free parking, free entertainment and free rides.