Recent content by lownlazy

  1. L

    Finding power figures from graph data

    I was wondering... do you think it would be more accurate to find the power for each of the 12 intervals and get the average from across those?
  2. L

    Finding power figures from graph data

    Yes I should have mentioned this earlier, the acceleration starts in the interval before X1. I didnt include it because it is impossible to know its real angle and is therefore null data. Does this effect what you have replied with so far?
  3. L

    Finding power figures from graph data

    I will give this (above quoted) a go for sure. In you reply you say that the 1.6 micro-second interval " assuming a uniform velocity within that timescale is not a good approximation." are you saying I am working with "bad" data? If so does this mean that i try your solution, or any solution...
  4. L

    Finding power figures from graph data

    I need help! Could you please double checking my work: calculating a Power information from data I am collecting. I have been Googling and wiki'ing for weeks now and I think I have it right but I need someone to confirm or correct what i have done.. The graph data comes from and Optical Rotary...
  5. L

    Excel's Power trendline formula?

    Can you please tell me what MS Excel uses to find a Power trendline? I have been experiment with data from my PunchBot project and it seems the Power Trendline fits the best. The plan is the used the data from my machine (an array of time intervals) to find the curve of the acceleration and...
  6. L

    Determine inital force from velocity and weight

    righto. thanks for the reply. :)
  7. L

    Determine inital force from velocity and weight

    Firstly, I am sorry for what is likely stupidly simple question however I can't find a helpful answer in Google so I must be missing obvious. Can you determine the initial force that moved an object by knowing only its current velocity and weight? So if a 1kg object is moving through space...
  8. L

    Measuring punching G-Force on a Pendulum

    Ahh see that makes sence. I was see "kg m2" and I was thinking what does surface area have to do with it? :) Thanks for you help mfb, that has me pointed in the right direction.
  9. L

    Measuring punching G-Force on a Pendulum

    thats cool :)
  10. L

    Measuring punching G-Force on a Pendulum

    I had consider an accelerometer but I decided against it because they get increasingly noisy the higher the G figure you want to read from them. Obviously the g reading is relative to the weight of the punching bag but by my approximate calculations you would need a 5-10g+ bag to bring the...
  11. L

    Measuring punching G-Force on a Pendulum

    I googled "moment of inertia" and (correct me if I am wrong) it looks like I should to calculated each part (axis, rod, head/pag) of the swing arm construction and add them all up to arrive and mass figure?
  12. L

    Measuring punching G-Force on a Pendulum

    Yes I would like to calculate it properly, can you please expand on that? Or perhaps Can you point me at a website that has a formula?
  13. L

    Measuring punching G-Force on a Pendulum

    I am building a machine for my martial arts club so that I can have a bit of fun and measure the speed and reaction times of my club mates. The design that I feel would yield the most reliable and accurate results would be to mount an upside down 'pendulum' on a frame. At the head of the...
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