A noninertial reference frame is a coordinate system that is accelerating or rotating with respect to an inertial reference frame. This means that objects within a noninertial reference frame will experience a fictitious force that is not present in an inertial reference frame.
An inertial reference frame is a coordinate system that is not accelerating or rotating, and therefore obeys Newton's laws of motion without the need for any additional forces. A noninertial reference frame, on the other hand, is accelerating or rotating and requires the addition of fictitious forces to account for the observed motion of objects within the frame.
Some common examples of noninertial reference frames include a car making a turn, a rotating carnival ride, or an elevator accelerating upward or downward. In all of these cases, the observer within the frame experiences a fictitious force that is not present in an inertial reference frame.
In a noninertial reference frame, measurements and observations will appear to be different than in an inertial reference frame. This is because the fictitious forces present in the noninertial frame can alter the motion or behavior of objects within the frame, leading to different observed values.
Noninertial reference frames are often used in scientific experiments or calculations because they can simplify the analysis of complex systems. By choosing a noninertial reference frame that is accelerating or rotating along with the system, we can eliminate the need to account for certain forces and make calculations easier. However, it is important to recognize when a noninertial reference frame is being used and account for any fictitious forces that may be present.