Recent content by iyerk0

Hi, As a final followup, i found a good video demonstrating the point i was talking about. I am trying to embed the video here. http://www.metacafe.com/watch/642856/broken_desk_on_the_daily_buzz/" or here is the link http://www.metacafe.com/watch/642856/broken_desk_on_the_daily_buzz/ The...

Yes you are right that action and reaction act on different bodies. But remember that man+swing act as a SINGLE body. So when man applies force to swing, then swing responds with equal and opposite force back to man and the forces are statically balanced since they are conected to each other...

Looking from the momentum point of view as well we consider the following to happen. Sit on a swing and start from a motionless state. Now i know that it is possible for a person sitting in the swing to gradually start increasing the amplitude of the swing without pushing against the ground or...

By using the term EXCESS you do realize you are violating Newton's third law of motion don't you? (every action has an EQUAL and opposite reaction) :devil:

Well if the pivot is providing the force (and somehow not the person sitting in the swing) then the following should happen: Consider the empty swing, since the pivot is providing the force, the swing should start swinging all by itself !

no the cart does not move towards the center of the earth. It is resting on a simple planar surface and cart is subject to gravitational force. The only variables to play around with are whether it is a friction free surface or a frictional surface. Of course you may consider bending, warping...

are you imagining that a person standing on the ground pushing the swing? (since you mentioned external force) Do you know that for increasing the amplitude of the swing a person sitting on the swing can do so without even touching his feet to the ground?

well which case does this apply to ? the frictionless case or the frictional case? or both?

No i am not ! That is why i stated that i sit in the cart and keep my arms and legs inside without contacting any external surface.

Hi, I am new poster on this forum. Apologies if you have already answered a similar problem before. let me get to the point straightaway. Now consider one example: Take a shopping cart and sit in it. Now jerk your body in any manner you require. The goal is to create a net motion forward...