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- https://phys.libretexts.org/Courses/Merrimack_College/Conservation_Laws_Newton's_Laws_and_Kinematics_version_2.0/04%3A_C4)_Systems_and_The_Center_of_Mass/4.01%3A_The_Law_of_InertiaSo there is nothing wrong with the law of inertia, but there is a problem with the reference frame: if one wants to describe the motion of objects in a reference frame like a plane being shaken up or ...So there is nothing wrong with the law of inertia, but there is a problem with the reference frame: if one wants to describe the motion of objects in a reference frame like a plane being shaken up or a car that is speeding up or slowing down, we need to allow for the fact that objects may move—always relative to that frame—in an apparent violation of the law of inertia.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_I_-_Classical_Mechanics_(Gea-Banacloche)/02%3A_Acceleration/2.01%3A_The_Law_of_InertiaSo there is nothing wrong with the law of inertia, but there is a problem with the reference frame: if I want to describe the motion of objects in a reference frame like a plane being shaken up or a c...So there is nothing wrong with the law of inertia, but there is a problem with the reference frame: if I want to describe the motion of objects in a reference frame like a plane being shaken up or a car that is speeding up or slowing down, I need to allow for the fact that objects may move—always relative to that frame—in an apparent violation of the law of inertia.
- https://phys.libretexts.org/Courses/Gettysburg_College/Gettysburg_College_Physics_for_Physics_Majors/04%3A_C4)_Systems_and_The_Center_of_Mass/4.01%3A_The_Law_of_InertiaSo there is nothing wrong with the law of inertia, but there is a problem with the reference frame: if I want to describe the motion of objects in a reference frame like a plane being shaken up or a c...So there is nothing wrong with the law of inertia, but there is a problem with the reference frame: if I want to describe the motion of objects in a reference frame like a plane being shaken up or a car that is speeding up or slowing down, I need to allow for the fact that objects may move—always relative to that frame—in an apparent violation of the law of inertia.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_I_-_Classical_Mechanics_(Gea-Banacloche)/02%3A_Acceleration/2.04%3A_In_SummaryThe rate of change of an object’s velocity is the object’s acceleration: the average acceleration over a time interval \(\Delta t\) is \(a_{av} = \Delta v/ \Delta t\), and the instantaneous accelerati...The rate of change of an object’s velocity is the object’s acceleration: the average acceleration over a time interval \(\Delta t\) is \(a_{av} = \Delta v/ \Delta t\), and the instantaneous acceleration at a time \(t\) is the limit of the average acceleration calculated for successively shorter time intervals \(\Delta t\), all with the same initial time \(t_i = t\).
