Physics help =(
-
Guys,Can help me with this...i am kinda confuse how the concepts works..
Type of Charges produced on different materials by the process of Friction.
1.If Perspex Ruler rubbed with woollen duster.
Which of the material will be postive charge and Negative charge?
2.If Polythene strip rubbed with wollen duster.
Which of the material will be postive charge and Negative charge?
3.Cellulose acetate rubbed with woolen duster.
Which of the material will be postive charge and Negative charge?
Why arhs?Why is it so?I dont get it ... -
Extracted from http://www1.curriculum.edu.au/sciencepd/readings/elec.htm
in this case, the outer electrons of the atoms in the Perspex rod are held more loosely than the outer electrons of the atoms in the cotton cloth.
When these materials are rubbed together, it is more likely that some of the electrons in the Perspex rod will be rubbed off by the atoms in the cotton cloth.
This means the Perspex will not have enough electrons to balance the positive charge of the nucleus. Therefore, the Perspex rod will have an overall positive electric charge.
Tip for O levels:
Just memorize which material are more prone to positive or negative charges. O levels just test those few materials mentioned in ur textbook -
Thanks but i dont really get it...My text book also did not mention about Perspex and Polythene..and cellulose also.. Eagle ask eu arhs...is it when like when they loses electron they become postive?Which means when rubber rub with ruler the rubber will be negative charge...or do we need see the material being used and judge from there?
-
see which one lose easier, that one will become positive, then the other material will b negative...compare between the two materials used...Originally posted by jlzk:Thanks but i dont really get it...My text book also did not mention about Perspex and Polythene..and cellulose also.. Eagle ask eu arhs...is it when like when they loses electron they become postive?Which means when rubber rub with ruler the rubber will be negative charge...or do we need see the material being used and judge from there? -
Originally posted by jlzk:
im my experience of chionging o level tys and past yr exam papers i dont recall having even one question on which material will become +ve and -ve. dont worry about it. i 99% will not come out. just memorise it if you want.
Guys,Can help me with this...i am kinda confuse how the concepts works..
[b]
Type of Charges produced on different materials by the process of Friction.
1.If Perspex Ruler rubbed with woollen duster.
Which of the material will be postive charge and Negative charge?
2.If Polythene strip rubbed with wollen duster.
Which of the material will be postive charge and Negative charge?
3.Cellulose acetate rubbed with woolen duster.
Which of the material will be postive charge and Negative charge?
Why arhs?Why is it so?I dont get it ...[/b] -
Orh..i try chiong chiong chiong thnks for ya info guys i will work on it de...cos this appear in my work book...its dam dumb nut...workbook ask textbook no answer...
-
Originally posted by unclebutcher:
true... its quite dumb to set this type of qn... who bothers w which is positive or negative... if u consider frm which material lose electrons more easily den becomes chemistry qn liao, beyond level liao
im my experience of chionging o level tys and past yr exam papers i dont recall having even [b]one question on which material will become +ve and -ve. dont worry about it. i 99% will not come out. just memorise it if you want.[/b]
ask ur teacher if need to noe this kind of stuff, if noe then LL must memorise -
u can always use homework forum =DOriginally posted by jlzk:Orh..i try chiong chiong chiong thnks for ya info guys i will work on it de...cos this appear in my work book...its dam dumb nut...workbook ask textbook no answer... -
This is O lvl
-
saw the replies and i must say good job eagle and unclebutcher
keep it up! though i cant really help because i am better at language stuff but i m monitoring this forum so i noe wads going on
-
heheh..Thnsk guys...Stupid workbook..i only N lvl nia bully sia...keep charge here and there...later i give their head a charge make them wake up.
-
o.O ok cause all the materials u listed there i blur lolOriginally posted by jlzk:heheh..Thnsk guys...Stupid workbook..i only N lvl nia bully sia...keep charge here and there...later i give their head a charge make them wake up.