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# physic cw help!!! slingshots watch

1. I am carrying out a experiment about slingshots
basically the first thing I don't is measured the distance from the 2 nails which the elastic is tied on till the point when the stone goes. it is 12cm.
i then used a a force meter to work out how much force is required for the elastic to stretch 1cm at a time to the end 12cm.

the result was that for the elastic to stretch 12 cm a force of 12N is required, i done the same for 11,10,9...cm and then plotted a graph. the RESULT is that it positive exponential graph. THE QUESTION SHOULD IT BE? OR SHOULD IT BE A STRAIGHT LINE GRAPH???
2. f = 1/2 kx^2 for such a system, so yes I think it is correct.
3. (Original post by tez.)
f = 1/2 kx^2 for such a system, so yes I think it is correct.
This is potential energy.

I am carrying out a experiment about slingshots
basically the first thing I don't is measured the distance from the 2 nails which the elastic is tied on till the point when the stone goes. it is 12cm.
i then used a a force meter to work out how much force is required for the elastic to stretch 1cm at a time to the end 12cm.

the result was that for the elastic to stretch 12 cm a force of 12N is required, i done the same for 11,10,9...cm and then plotted a graph. the RESULT is that it positive exponential graph. THE QUESTION SHOULD IT BE? OR SHOULD IT BE A STRAIGHT LINE GRAPH???
Can you make a sketch and indicate what values you were measuring?

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Updated: March 28, 2011
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