In the figure on page 153, the string is pulled horizontally, exactly parallel t

Question

In the figure on page 153, the string is pulled horizontally, exactly parallel to the track or table (at a zero degree angle). If the string were pulled so that it makes a positive angle above the horizontal, but the block still moves at a constant velocity, what can we say when we now compare the magnitude of the applied force and the friction force?

A) the applied force must now be less than friction force since the normal force must be less B) The applied force must be greater than the friction force since only the horizontal component of the applied force counteracts the friction force C) The applied force must be the same as the case when the applied force was horizontal is the speed is the same D) It depends on the angle the applied force makes with the horizontal, so we can't say anything

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which book?

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