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Mathematics

Grade 5

Measurement and time

Module 52

Mass

Activity 1:

To solve problems that include the selection of standard units [lo 4.6]

1. As in length, it is essential that we know when to use grams, kilograms and tons as units.

Work with a friend, taking turns. Take any three objects in your class. Hold each one separately and arrange them from the lightest to the heaviest. In which unit would you weigh these items: grams? kg?; ton?

Complete the table:

Item From light to heavy Unit
1 . .......................................... .......................................... ..........................................
2 . .......................................... .......................................... ..........................................
3 . .......................................... .......................................... ..........................................

DO YOU STILL REMEMBER?

1 000 g = 1 kg

1 000 kg = 1 ton

Sometimes an object can be so light that you can’t weigh it on a normal scale. Tick the objects that you think weigh less than 1 gram.

a feather a rubber a pin
a staple an orange a grain of sand
a hair elastic a pen a hair

Activity 2:

To measure and record [lo 4.5.1]

To measure accurately using appropriate measuring instruments [lo 4.7.1]

DID YOU KNOW?

When we want to determine the mass of an object, it means that we want to know how heavy it is or how much it weighs . To be able to do this, we need a scale .

Please write down all the different kinds of scales you can think of:

  1. Study the following scales carefully. Work with a friend and write down the reading of each scale.

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. Look at the following drawings and write down the mass of each object:

2.1

2.2

2.3

2.4

Activity 3:

To estimate, measure and record [lo 4.5.1]

To measure accurately using appropriate measuring instruments [lo 4.7.1]

Work in groups of three. Bring the following items from home:

A scale; 1 cup of raw rice; 1 cup of sugar; 1 cup of flour; 1 cup of salt; 1 cup of all bran/corn flakes and 1 cup of raisins.(Remember to use the same cup each time you measure).

1. Determine the mass of each item and complete the table.

Item Mass in g estimated Item weighed Difference
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................
.............................................. ......................... ..................... .....................

2. Which item is the heaviest?

3. Which item is the lightest?

Activity 4:

To solve problems that include selecting, calculating with and converting standard units [lo 4.6]

LET US REVISE!

Questions & Answers

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s.
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Abhijith Reply
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s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
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SUYASH
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s. Reply
of graphene you mean?
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Ebrahim
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Graphene has a hexagonal structure
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I start with an easy one. carbon nanotubes woven into a long filament like a string
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AMJAD
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Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
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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
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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
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Source:  OpenStax, Mathematics grade 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10994/1.3
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