Posted in Health-01-02 by admin
on December 31, 2008
Max Energy
2 experiments to calc the max energy from a slingshot?
I need two experiments to calculate the maximum energy available from a catapult. I've already established 1 method but i still think it needs a little work.
There are two easy ways:
1) Measure the velocity of the arm as it moves. If you have access to a high speed camera that would be best, otherwise you could try to try to measure distance/time. This is the velocity that the ammunition will have as it leaves the slingshot- square that velocity, divide by 2, then multiply by mass of the ammunition and you've got kinetic energy. If you want the kinetic energy of the slingshot itself, do the same thing, but use the mass of the arm.
2) A better way would be to measure the potential energy of the spring (or whatever elastic material you are using that is the same as a spring). If you know the spring constant then the energy is 1/2kx^2, where k is the spring constant and x is the distance the spring is displaced when you pull the arm back. If you don't know the spring constant, you can work it out using Hooke's Law. Look that up if you care about that.
If you do the calculations right, all the potential energy at the beginning will turn into kinetic energy at the end, due to conservation of energy.
Hope this helps
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