IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: Hesham Mhd on May 06, 2010, 09:58:15 pm

Title: Precautions and improvements (for paper 6 physics) !
Post by: Hesham Mhd on May 06, 2010, 09:58:15 pm

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

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: Hesham Mhd on May 06, 2010, 10:10:55 pm

Guys plz help this is the aim of paper 6!!

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: IG4ever on May 07, 2010, 10:41:00 am

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

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: 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?

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: holtadit on May 07, 2010, 11:17:22 am

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?

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)

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: Hesham Mhd on May 07, 2010, 11:47:42 am

but if we use a protractor, will that be correct too? i mean it should be 90* for it to be hor./vertical right?

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: Vin on May 07, 2010, 12:27:32 pm

Quote from: Hesham Mhd on May 07, 2010, 11:47:42 am

but if we use a protractor, will that be correct too? i mean it should be 90* for it to be hor./vertical right?

how would u do that while the ruler's in horizontal..?

its pretty much easy for nything thts vertical..

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: Hesham Mhd on May 07, 2010, 12:49:06 pm

i think it depends on the way yu place the protractor, but nvm, using a set square is more guaranteed anyway

Title: Re: Precautions and improvements (for paper 6 physics) !
Post by: Vin on May 08, 2010, 07:11:16 am

no its ok i wanna kno .. how would u place a protractor while the ruler's in horizontal?