When we solved the problem of a block sliding down an inclined plane we chose ou

Question

When we solved the problem of a block sliding down an inclined plane we chose our coordinate system such that one axis was parallel to the plane and one was perpendicular. This choice differed from the "horizontal-vertical" system we often think of. Using the defition of work, explain why the parallel-perpendicular choice provides the solution whereas the horiztonal-vertical choice does not. Consider the forces acting on the block, and indicate which force(s) is(are) capable of doing work as the block slides down the plane.

Explanation / Answer

we did not use horizontal vertical, because in that casethe normal reaction which is perpendicular to the incline will be at an angle hence making it difficult for the forces to resolve

force responsible for block sliding down ==> gravity

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