Physics help please - Sources of error in lab experiments

  1. Physics help please -- Sources of error in lab experiments

    Ok so i need some help with a few labs.. some i've tried out and a few i just cant get.. what i want to know is whether the limitations and sources of errors that i wrote down for each of these labs are correct or not and what i could have said instead. Thank you for your help in advance.

    Sources of errors for center of gravity of an irregular shaped object:
    -environmental error: when the wind blows it may remove the irregular shaped object from equilibrium.
    - (i couldnt think of a next one)

    sources of errors for density column:
    - parallex error: when pouring the liquid into the container, the container should be on a flat surface and poured with eyes at an eye level or at 90 degrees.
    - do not pour liquids along the side of the container to avoid mixing

    limitations for density column:
    -pouring should be gentle to avoid the mixing of the liquids
    - try tilting the container a little so that the liquid you are adding runs down the side more slowly

    sources of errors for rate of conduction of heat in copper, nickel, tin, brass and aluminium:
    -human reaction time error: was slow when timing the exact time the match stick fell
    - mechanical error: electrical glitches when using the stop watch

    sources of errors for thermal expansion of ball and ring:
    - mechanical error: electrical glitches when using the digital vernier caliper
    -(i could not think of another one)
     
  2. jcsd
  3. Re: Physics help please

    Sources of errors for center of gravity of an irregular shaped object:
    -environmental error: when the wind blows it may remove the irregular shaped object from equilibrium.
    - (i couldnt think of a next one)

    add: density variations, shape variations 'say, thickness], in ability to measure precisely, inability to compute precisely....

    sources of errors for density column:
    - parallex error: when pouring the liquid into the container, the container should be on a flat surface and poured with eyes at an eye level or at 90 degrees.
    - do not pour liquids along the side of the container to avoid mixing

    add: density varies slightly with height, with temperature, with atmospheric pressure,

    limitations for density column:
    -pouring should be gentle to avoid the mixing of the liquids
    - try tilting the container a little so that the liquid you are adding runs down the side more slowly

    sources of errors for rate of conduction of heat in copper, nickel, tin, brass and aluminium:
    -human reaction time error: was slow when timing the exact time the match stick fell
    - mechanical error: electrical glitches when using the stop watch

    add: impurities in metals, measurement instrument variations, different ambient temperatures,varying ambient temperatures, thickness/size of metals,

    sources of errors for thermal expansion of ball and ring:
    - mechanical error: electrical glitches when using the digital vernier caliper

    variations in temperature of heat source...location of ball ring wrsp to heat source; cooling while measuring, ambient condition variations,
     
  4. Re: Physics help please -- Sources of error in lab experiments

    thank you very much for your help.. by the way are those i came up with okay?
     
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