a-book-rests-on-a-table-inclined-at-an-angle-of-30-with-respect-to-horizontal-gr

Question

A book rests on a table inclined at an angle of 30° with respect to horizontal ground level. Why should we consider static rather than kinetic friction in this case?

Accepted Answer

Because the book is stationary and only static friction can act on stationary objects.

Answer

Because only kinetic friction can act on stationary objects.

Answer

Because only static friction can act on moving objects.

Answer

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A book rests on a table inclined at an angle of 30° with respect to horizontal ground level. Why should we consider static rather than kinetic friction in this case?