1i thnk it depends on friction...of the table...and if mass is given..
and thn we can use the fact tht rolling friction is least....
A small object is at rest on the edge of a horizontal table.It is pushed in such a way that it falls off the other side of the table,which is 1m wide in 2s.Does the object have wheels ??
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9 Answers
1no
cuz if it had wheels then it wud hav had fallnon d same side
nw as it dnt hav wheel .itz due to frictio dat it falls ..on d oder side
62I dont think we can say much about this ronald..
As far as I understand it could have a wheel or could not.. in both cases it can fall on the other side...
Where did you get this problem from?
1
11Bhaiya i found it while going thru the book --
"200 Puzzling problems In Physics"
66The problem is more of an estimation rather than a deterministic one. The average speed of the object is 1/2 m/s. Assuming it decelerated uniformly we also have
v_\mathrm{average}=\dfrac{1}{2}(v_\mathrm{inital}+v_\mathrm{final})
and so the initial speed could not have exceeded 1m/s. (WHY?)
Thus the speed of the body decreases by at least 1m/s in 2 s. Thus its retardation is at max 0.5 m/s2. i.e. approximately g/20. As such the coefficient of kinetic friction between the object and the table cannot exceed 1/20. This is quite small and therefore it is very likely that the object does not slide but a part or all of it rolled. Hence, most probably the object has wheels.
11Kaymant Sir , I could not understand as to why the initial speed of the object can not exceed 1 m/s.... Sir could you please explain that part....
11@ Aditya- because Vfinal can never be less than 0.
Vavg is given =1/2
Therefore,,Vi can never be more than 1.