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Wiskunde

Graad 5

Meting en tyd

Module 41

Massa

Massa

Aktiwiteit 1:

Om probleme op te los wat die kies van standaardeenhede insluit [LU 4.6]

1. Net soos by lengte, is dit noodsaaklik dat ons sal weet wanneer om gram, kg en ton as eenheid te gebruik.

Werk saam met ’n maat en maak beurte. Neem enige drie voorwerpe in jou klas. Hou elkeen apart vas en rangskik hulle dan van die ligste tot die swaarste. In watter eenheid sal jy jou items weeg: gram? kg? ton?

Voltooi die tabel:

Item Van lig tot swaar Eenheid
1 . .......................................... .......................................... ..........................................
2 . .......................................... .......................................... ..........................................
3 . .......................................... .......................................... ..........................................

Onthou jy nog?

1 000 g = 1 kg

1 000 kg = 1 ton

Soms is items / artikels so lig dat jy nie kan sien hoeveel hulle weeg op ’n gewone skaal nie. Maak ’n regmerkie by dié wat jy dink ’n massa van minder as 1 gram het.

’n veer
’n krammetjie
’n haarrekkie
’n uitveër
’n lemoen
’n pen
’n koppiespeld
’n sandkorrel
’n haar

Aktiwiteit 2:

Om te meet en op te teken [LU 4.5.1]

Om met toepaslike meetinstrumente presies te meet [LU 4.7.1]

Het jy geweet?

Om die massa van ’n item te bepaal, beteken dat ons wil weet hoe swaar die item is of hoeveel dit weeg . Om dit te kan doen, benodig ons ’n skaal . Aan hoeveel verskillende soorte skale kan jy dink?

Skryf hul name hier neer.

1. Kyk goed na die volgende voorbeelde van skale. Werk saam met ’n maat en skryf die lesing op elke skaal neer.

1.1

1.2

1.3

1.4

1.5

1.6

2. Kyk na die volgende tekeninge en skryf die massa van die voorwerpe neer.

2.1

2.2

2.3

2.4

Aktiwiteit 3:

Om te skat, te meet en op te teken [LU 4.5.1]

Om met toepaslike meetinstrumente presies te meet [LU 4.7.1]

Werk in groepe van drie. Bring die volgende items van die huis af saam:

’n skaal ; 1 koppie rou rys ; 1 koppie suiker ; 1 koppie koekmeel ; 1 koppie sout ; 1 koppie graanvlokkies en 1 koppie rosyntjies.(Onthou om dieselfde koppie te gebruik wanneer julle afmeet!)

1. Bepaal nou die massa van bogenoemde en voltooi die tabel.

Item Massa in g geskat Gemeet Verskil
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................

2. Wat weeg die swaarste?

3. Wat weeg die ligste?

Aktiwiteit 4:

Om probleme op te los wat die kies van berekening met en herlei van standaardeenhede insluit [LU 4.6]

Questions & Answers

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Shanjida
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
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Chris Reply
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
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abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
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Cesar
I'm interested in nanotube
Uday
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Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Wiskunde graad 5. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col10993/1.1
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