Tension on string pulling up water

  • Thread starter sfgradv
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  • #1
sfgradv
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A 6-kg of water is being pulled straight up by a string. The upward acceleration of the bucket is constant, with magnitude 3 m/s^2

I need to find Tension. I have a problem getting the formula for this question. Can someone please help me? Thanks!
 

Answers and Replies

  • #2
Doc Al
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The "formula" you need is Newton's 2nd law. To apply it, you'll need to identify the forces acting on the bucket of water.
 
  • #3
sfgradv
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Is it F = T-mg=ma?
 
  • #4
Doc Al
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Exactly right.
 
  • #5
sfgradv
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Am I supposed to plug in -9.8 since gravity is pulling it down or 9.8 since the negetive is already in the formula for g?
 
  • #6
Doc Al
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g = 9.8 m/s^2; the negative sign is already in the formula by putting the weight as "-mg".
 
  • #7
sfgradv
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What if the acceleration is downwards? Would it be T = mg - ma?

Does anyone know?
 
Last edited:
  • #8
Doc Al
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sfgradv said:
What if the acceleration is downwards? Would it be T = mg - ma?
That's correct.
 

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