The answer is B.
Reason:
Because the boxes weigh the same and are on the same degree of incline,
the only factor to consider is the surface-to-surface contact area
(friction), as indicated by
the dotted lines.
As friction hinders the movement
of an object. Thus, the box with less friction will slide down the ramp more
easily. Considering
only the amount of contact (since the boxes are made of the same
material), Box B has less
surface-to-surface Contact with the ramp when compared to Box A and the
ramp. Thus, it
will move down the ramp more easily.
If the boxes were the same size and weight, and were made of the same
material, gravity
would be the only factor affecting movement down the plane and they
would move with
equal ease.
If the boxes had the same weight and size, but were made of different
materials, it would
be impossible to determine which one moves more easily without
information about the
materials. This is because the Smoothness or coarseness of the material
on the surface
of an object affects the amount or degree of friction that is created
when it is moved or
slid across another surface.
