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PHYS 2211 ABCDE Spring 08
MP13: Equilibrium
Due at 11:59pm on Thursday, January 31, 2008
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Block on an Incline
A block lies on a plane raised an angle
from the horizontal. Three forces act upon the block:
, the force of gravity;
, the
normal force; and
, the force of friction. The coefficient of friction is large enough to prevent the block from sliding .
Part A
Consider coordinate system a, with the
x
axis along the plane. Which forces lie along the axes?
ANSWER:
only
only
only
and
and
and
and
and
Part B
Which forces lie along the axes of the coordinate system b, in which the
y
axis is vertical?
ANSWER:
only
only
only
and
and
and
and
and
Now you are going to ignore the general rule (actually, a strong suggestion) that you should pick the coordinate system with
the most vectors, especially unknown ones, along the coordinate axes. You will find the normal force,
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 Spring '08
 UZER
 Physics, Force, Friction, Assignment Print View

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