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    Simple Harmonic Motion (F=-kx) - Help!

    Exactly! The spring will always oppose the applied force, in this case being your pulling / pushing the block. While it is true that the problem does not explicitly specify the direction of the stretching, it is implied. If this spring is vertical, presumably with one end of the spring fixed...
  2. A

    Simple Harmonic Motion (F=-kx) - Help!

    Consider a spring with one end fixed to a wall and the other end connected to a block. If you were to pull the block in the positive x-direction, in which direction would the spring force act? If you were instead to push the block in the negative x-direction, in which direction would the spring...
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