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String Attached to a Block on a Horizontal Surface

Consider a string attached to a block on a horizontal surface. If you gradually pull very gently and horizontally on the string and increase the force very slowly until the block moves at a constant velocity. What happens to the frictional force just as the block begins to slide? Explain.

Solution Preview

We analysis three different status of the block.
In the first phase, the block does not move. It is ...

Solution Summary

Solution includes a diagram and brief explanation. 75 words.