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Precautions and improvements (for paper 6 physics) !

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Hesham Mhd:
1- Temperature change questions -what variables are there + improvements + sources on errors- ???
2- Questions concerning springs -what variables are there + improvements- ???

Hesham Mhd:
Guys plz help this is the aim of paper 6!!

IG4ever:
1-Temperatures:
a) Variables: i.use of identical beakers
                  ii. use of same volume of water
                  iii. same initial temperature
                  iv. same time interval
b)Improvements : i. repeating the experiment and take the average of readings ( thats to experience the least possible experimental errors)
                        ii. wrapping the beakers with cotton/wool ( to reduce heat lost to the surroundings)
c) sources of errors: i.parallax errors when taking the readings from the thermometers ( avoid this by looking perpendicular to the scale)
                            ii.when recording volumes of water look at the bottom of the meniscus

Hesham Mhd:
Thanks alot, i appreciate this :D, and, how can yu check that a metre rule, for example, is horizontal/vertical? I guess by using a protractor right?

holtadit:

--- Quote from: Hesham Mhd on May 07, 2010, 11:10:29 am ---Thanks alot, i appreciate this :D, and, how can yu check that a metre rule, for example, is horizontal/vertical? I guess by using a protractor right?

--- End quote ---

Use a set square (for horiz and verti)

or

Measure the height of two points along the ruler; they should be the same height (for checking if horizontal)

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