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The dilemma of Frictionless Surface
Posted: Thu Nov 10, 2011 11:30 pm
by Abdul Muntakim Rafi
A 60 kg farmer ropes a 300 kg ox. Both are initially at rest, 24 m apart on a frictionless level surface. When farmer ends up pulling the ox towards him, the ox will move
A) 4m, B) 5m, C) 12m, D) 20m, E) 24m .
What do you think?
Re: The dilemma of Frictionless Surface
Posted: Fri Nov 11, 2011 11:09 pm
by nafistiham
i think it is $24$m
Re: The dilemma of Frictionless Surface
Posted: Sat Nov 12, 2011 3:35 am
by tanvirab
Since there is no friction, there will be equal and opposite forces on the ox and the farmer. So they will move towards each other and collide. Their acceleration will be force/mass. Since you know the acceleration of both (and that they were at rest at the beginning) you can use S.S.C. Newtonian physics to find at what distance they will collide.
Re: The dilemma of Frictionless Surface
Posted: Sat Nov 12, 2011 9:31 am
by Abdul Muntakim Rafi
Yeah... $4$ m...
Re: The dilemma of Frictionless Surface
Posted: Tue Jan 03, 2012 10:41 pm
by raihan khan
they will collide in the center of mass of their system as there is no external force.
Re: The dilemma of Frictionless Surface
Posted: Tue Jan 03, 2012 10:45 pm
by tanvirab
raihan khan wrote:they will collide in the center of mass of their system as there is no external force.
Very nice solution
