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# Mechanics Question watch

1. I'd be grateful if you could help me with this question. I thought to use F=ma, but was wrong. Thanks!

A lift and it's passengers with a total mass of 500kg accelerates upwards at 2ms^-2. Assume that g-10 ms^-2. What is the tension in the cable that holds the lift to the ceiling?
2. Is the answer 6000N?
3. Tension would be the resultant + gravity. Since tension is the force needed to accelerate the lift by 2ms^-2 whilst it is under gravity.
4. Great, thanks. Yes - its 6000N.
5. (Original post by liamsullivan)
I'd be grateful if you could help me with this question. I thought to use F=ma, but was wrong. Thanks!

A lift and it's passengers with a total mass of 500kg accelerates upwards at 2ms^-2. Assume that g-10 ms^-2. What is the tension in the cable that holds the lift to the ceiling?
I think F=ma is the right approach, a tip is to draw a force diagram with all the known forces and the resultant. Also write the other things you know like acceleration on the force diagram so it is clearer if you haven't already.

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6. (Original post by liamsullivan)
Great, thanks. Yes - its 6000N.
If you sub the forces into F=ma:
T-500g = 500 * 2
T=6000N

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