BASIC PHYSICS tension in a cable

andieje
andieje used Ask the Experts™
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Hi

I asked this question recently:

The question has a crane lifting a mass of 1500kg with an acceleration of 3 ms^2. What is the tension cable on the crane during this period of velocity.

Answer:
the net upward force = mass * acceleration = 4500 N
the downward force due to gravity is (1500 8 9.8) = 14700 N
total upward tension on the cable must be (4500 + 14700) = 19200 N

But the question says what is the tension in the cable? How do you word the answer? Do you say 'the cable has an upward tension of 19200 N and a downward tension of 14700 and so the cable has a net upward tension of 4500N'

thanks


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Commented:
it's not an  "upward tension", it's just "tension". but the magnitude is correct.
Commented:
tension on the  cable is (4500 + 14700) = 19200 N

As you pull up on the cable the tension in the cable is the force which you (or any machine) puts on the cable which is then transferred to the object on the other end of the cable.

Author

Commented:
so the tension on the cable is the total 'upward' force not the net force?
"so the tension on the cable is the total 'upward' force not the net force?"
If I understand you correctly, yes

Author

Commented:
thanks

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