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Wiskunde

Graad 5

Meting en tyd

Module 40

Lengte

In hierdie leereenheid gaan ons kyk na verskillende eenhede om lengte mee te meet, asook na die belangrikheid daarvan om akkuraat te meet.

Aktiwiteit 1:

Om te meet en op te teken [lu 4.5.3]

Om met toepaslike meetinstrumente presies te meet [lu 4.7.3]

1. Kom ons spring sommer dadelik weg! Hoe goed ken jy jouself? Meet die volgende so akkuraat moontlik – ‘n maat mag jou help:

1.1 die lengte van jou duimnael

1.2 die lengte van jou pinkie

1.3 die lengte van jou regtervoet

1.4 die lengte van jou linkerarm van jou skouer tot by die punt van jou middelvinger

1.5 Hoe lank is jy?

1.6 Hoe hoog kan jy bykom as jy spring van die grond af?

1.7 Hoeveel hoër is dit as jyself?

2. Wat het jy gebruik om bogenoemde te meet?

3. Watter ander meetinstrumente kan ons nog gebruik om lengtes mee te meet?

Onthou jy nog?

1 cm = 10 mm

1 m = 100 cm

1 m = 1 000 mm

1 km = 1 000 m

Het jy geweet?

  • 1 meter is omtrent die afstand van ’n grootmens se neus tot by die punt van sy uitgestrekte hand se middelvinger.
  • 1 cm is ongeveer die lengte van ’n vingernael.
  • 10 cm is ongeveer die lengte van ’n hand.
  • 1 mm is min of meer die breedte van die spasie onder jou vingernael.
  • 10 mm is ongeveer die breedte van ’n pinkie.

4. Werk saam met ’n maat en voltooi die volgende tabel.

Meet Skatting Ware afmeting Verskil
a) die lengte van jou opvoeder
b) die breedte van jul klaskamer
c) die hoogte van jou bank / tafel
d) die totale lengte van die skryfbord in die klas

Aktiwiteit 2:

Om probleme op te los wat die kies van berekening met en herlei van standaard- eenhede insluit [lu 4.6]

1. Dit is belangrik dat ons sal weet watter meeteenhede vir spesifieke lengtes gebruik word. Om dit korrek te kan doen, is dit noodsaaklik dat ons sal weet presies hoe lank die verskillende meeteenhede is. Kom ons kyk hoe vaar jy! Kies ‘n geskikte eenheid om die volgende te meet:

1.1 Die borsmaat van Pa se pak klere is 102 ....................

1.2 Die hoogte van my kamermuur is 4 ....................

1.3 Die breedte van die stoep van die plaashuis is 2,5 ....................

1.4 Die dikte van my woordeboek is 40 ....................

1.5 Die afstand tussen Johannesburg en Kaapstad is meer as 1 000 ....................

1.6 Die diepte van die water in ons swembad is 1,500 ....................

2. Omkring die afmeting wat die naaste aan die werklikheid is:

2.1 Die deur van ons klas is ongeveer . . . . . . . . hoog.

(a) 20 m (b) 200 mm (c) 2 km (d) 2 m

2.2 My voet is omtrent . . . . . . . . lank.

(a) 26 cm (b) 26 mm (c) 26 km (d) 26 m

2.3 Die afstand van Durban na Oos-Londen is . . . . . . . . . . .

(a) 674 mm (b) 674 km (c) 674 m (d) 674 cm

3. Kom ons kyk na die desimale skryfwyse van lengte:

Ons weet reeds 10 mm = 1 cm

Dus: 25 mm = 10 + 10 + 5 mm

= 1cm + 1 cm + 5 mm

= 2 cm + 5 mm

= 2,5 cm of 2 1 2 size 12{ { { size 8{1} } over { size 8{2} } } } {} cm

Voltooi die tabel:

Aantal mm 10 85 ............ 245 ............ 1 026 ............
Aantal cm 1 ............ 4,2 ............ 17,9 ............ 146,3

4. Ons weet daar is 1 000 mm in 1 m

Dus: 2 347 mm = 2 m 347 mm

= 2,347 m

Voltooi die tabel:

mm m
4 328 4,328
..................... 3
367 .....................
..................... 4,7
28 .....................
..................... 0,067
6 .....................

Questions & Answers

Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Destiny Reply
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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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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