A block rests on a rough inclined plane which is accelerated to the right. If the block remains at the same position on the plane, which shown free-body diagram may represent the forces on the block? All diagrams are drawn for an inertial observer.
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Question

A block rests on a rough inclined plane which is accelerated to the right. If the block remains at the same position on the plane, which shown free-body diagram may represent the forces on the block? All diagrams are drawn for an inertial observer.

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G1 Physics · Accepted Answer

For an inertial observer only real forces act: weight mg, normal N and friction f. No pseudo force or separate 'ma force' is drawn. Friction must oppose the tendency of relative motion along the incline. The diagram satisfying these conditions is Image 3.