Classical mechanics
From Conservapedia
Classical mechanics refers to a branch of physics dealing with every-day laws of mechanics (as opposed to quantum mechanics). The term is interchangeable with "Newtonian physics", as it was Sir Isaac Newton who first proposed the first laws of motion. Classical mechanics is sufficient for explaining most observable phenomena.
Classical mechanics only breaks down in extreme conditions, such as traveling close to the speed of light, being near extremely high gravity, or dealing with subatomic particles. For example, the high speed correction is (1-(v^2/c^2))^.5 where v is the velocity of an object and c is the speed of light. At 1000 miles per hour, the correction is .999999999999991
