Why are we moving back when train starts accelerating.....can i get answers in terms of forces please?
hi tiny-tim,Hi xx!
It doesn't have anything to do with forces.
It's because of the absence of forces …
there's no force moving you forward, so when the train starts accelerating, you get left behind!
Video ,expanation and link was quite helpful.thanks alot!From,
"Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies; in fact, the First Law is just a special case of the Second Law for which the net external force is zero.
Newton's First Law contains implications about the fundamental symmetry of the universe in that a state of motion in a straight line must be just as "natural" as being at rest. If an object is at rest in one frame of reference, it will appear to be moving in a straight line to an observer in a reference frame which is moving by the object. There is no way to say which reference frame is "special", so all constant velocity reference frames must be equivalent."
no, the centre of mass wants to fall, and the only thing that can stop it is the wheel being in the way; the bike needs to ride round a corner which creates centripetal force (in the non-inertial reference frame of the bike), which would make it fall if the bike was upright, so the rider leans at the exact angle that keeps the wheel in the way!Allrite thanks alot bro.So now i get it why motorcyclists lean sideways completely,its because the centre of mass still wants to move in straight line but bike needs to ride round corner so it makes certain angle which provides centripetal force towards centre and also the friction of ground would help motorcyclist to turn round the corner!!