Great lecture series, thank you!! I had some initial confusion which resolved itself - may be worth sharing with fellow learners. I was thinking, even if the train moves at a constant velocity (hence in an inertial reference frame) and the traveler observes a free falling object - detached from the body of the train - in front, then it will appear to be coming towards him. On further thought, the distinction is the following. In the above description, the mass is initially kept attached to the body of the train till being dropped. So, in the constant velocity scenario the mass has already acquired the velocity of the train, so the traveler inside will observe it to be falling straight down upon being dropped. However, in the acceleration scenario (non-inertial reference S), he will still observe the mass to be rushing towards him upon being dropped.
Basically, the professor is talking about the "pseudo force" which we experience in an acceleratung frame. You know, just feel it, when a car accelerates, you feel a force backwards. That is pseudo force. Now, if you want to apply Newton's Law for non inertial reference frame, then just imagine that you are sitting in the car and you just need to apply an extra force on you in the opposite direction of acceleration. Balance all the other forces and use F = ma. Its just simple but I Don't know why is this professor making it so complicated my taking position vectors and so all.
Great lecture series, thank you!! I had some initial confusion which resolved itself - may be worth sharing with fellow learners. I was thinking, even if the train moves at a constant velocity (hence in an inertial reference frame) and the traveler observes a free falling object - detached from the body of the train - in front, then it will appear to be coming towards him. On further thought, the distinction is the following. In the above description, the mass is initially kept attached to the body of the train till being dropped. So, in the constant velocity scenario the mass has already acquired the velocity of the train, so the traveler inside will observe it to be falling straight down upon being dropped. However, in the acceleration scenario (non-inertial reference S), he will still observe the mass to be rushing towards him upon being dropped.
These are great videos! Much better than my mechanical engineering professor here in Australia. Thanks for the help!
Basically, the professor is talking about the "pseudo force" which we experience in an acceleratung frame.
You know, just feel it, when a car accelerates, you feel a force backwards. That is pseudo force.
Now, if you want to apply Newton's Law for non inertial reference frame, then just imagine that you are sitting in the car and you just need to apply an extra force on you in the opposite direction of acceleration. Balance all the other forces and use F = ma.
Its just simple but I Don't know why is this professor making it so complicated my taking position vectors and so all.
Hii...Sir