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# OCR mechanics helpp

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1. I'm stuck on q 5 on the OCR November 2002 paper. here's the question:
An object P of mass 0.2kg hangs by a string from a point O of the roof of a lorry. The lorry is moving horizontally with constant acceleration a m/s^2 and the string makes a constant angle of 8 degrees with the vertical. Find
i) the tension in the string
ii) the value of a

anybody know how to answer this???
2. (Original post by SI 1)
I'm stuck on q 5 on the OCR November 2002 paper. here's the question:
An object P of mass 0.2kg hangs by a string from a point O of the roof of a lorry. The lorry is moving horizontally with constant acceleration a m/s^2 and the string makes a constant angle of 8 degrees with the vertical. Find
i) the tension in the string
ii) the value of a

anybody know how to answer this???
Resolving forces vertically, you know that Tcos(8) = 0.2g, as there is no acceleration in this direction (forces up = forces down). Then resolve horizontally using F = ma. Does this help?
3. Here's the diagram for the question
Attached Images

4. (Original post by ombtom)
Resolving forces vertically, you know that Tcos(8) = 0.2g, as there is no acceleration in this direction (forces up = forces down). Then resolve horizontally using F = ma. Does this help?
Yup. Thank you!!!

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