Measurements | Term 2 Chapter 3 | 3rd Maths - Measurement of Weight
Chapter: 3rd Maths : Term 2 Unit 3 : Measurements
Measurement of Weight
UNIT−3
MEASUREMENTS
Measurement of Weight
Recall
Tick the heavier object
Showing posts with label Weight. Show all posts
Showing posts with label Weight. Show all posts
Measuring Weight Using a Simple Balance | 2nd Maths Term 3 Unit 3
2nd Maths: Term 3 Unit 3: Measurement
Teacher’s Note: Teacher can make students understand the need of standard measures.
Measuring weight using simple balance
Travel Through
Bharath and Kannagi buy grapes from two different fruit sellers from the road side shop.
Teacher’s Note: Teacher can make students understand the need of standard measures.
Learn
Small things can be weighed using simple balance.
Big things can be weighed using weighing machine.
A simple balance has two pans.
The pan with heavier object comes down.
The pan with lighter object goes up.
If both the objects are equal in weight, the pans will be in the same level.
Practice
A. Fill the boxes with ‘H’ for heavy and ‘L’ for light.
B. Tick (✔) the lighter side and cross (X) the heavier side of the simple balance.
Pleasure Time
Match the objects with the suitable balance that are used to measure the weight.
Objects to Match:
Jaggery
Beads
Rice bag
Sugar bag
Goldstuds
Elaichi
Activity
* Take two coconut shells, thread and a ruler.
* Tie the thread at the centre of the ruler.
* Tie the shells on both sides at equal distance from its centre. Now, the simple balance is ready.
* Take some marbles, pencil, eraser, crayons, chalk piece, paper, pencil box and paper.
* The children can be divided into group of three each.
* One child keeps the objects whose weight is to be measured on the right pan of the balance.
* The other child keeps adding marbles on the left pan of the balance till both the pans are balanced.
* The third child counts the marbles and records the weight of different objects.
Understanding Weight: Heavy vs. Light | 2nd Maths Term 3, Unit 3 Measurement
Comparison of weight
2nd Maths : Term 3 Unit 3 : Measurement
UNIT 3
Measurement
Travel Through
Thenaliraman and two villagers went to a town to visit their king. They want to give some gifts to him.
Teacher’s Note:
Discuss the story with children and make them realize the concept of heavy and light.
Learn
Blow and Observe
(i) Place a feather, a dry leaf, a key and a nail cutter on a table. Blow the things. What did you observe?
The feather and dry leaf moved away from the table but the nail cutter and keys did not, why? Feather and dry leaf are lighter and nail cutter and keys are heavier. So lighter objects fall down when air is blown.
(ii) Compare the weight of the objects that are placed on the table.
Sharpener is lighter than the book.
Pencil box is heavier than the eraser
Teacher’s Note:
Teacher can instruct children to carry two things at a time and say which one is heavier or lighter.
Practice
From your school bag, lift the objects given below and answer the following questions.
Practice
Compare the weight of objects given below and order them from lightest to heaviest by giving numbers 1, 2, and 3.
Understanding the Difference Between Mass and Weight | Physics Explained
Mass and Weight
Key Definitions
MASS AND WEIGHT
Mass
Mass: Mass is the basic property of a body. Mass of a body is defined as the quantity of matter contained in the body. Its SI unit is kilogram (kg).
Weight
Weight: Weight of a body is defined as the gravitational force exerted on it due to the Earth’s gravity alone.
Calculating Weight
The relationship between weight, mass, and gravity is expressed by the following formula:
Weight = Gravitational Force
mass (m) × acceleration due to gravity (g)
g = acceleration due to gravity for Earth (at sea level) = 9.8 m s–2.
Properties of Weight
Weight is a vector quantity. Direction of weight is always towards the centre of the Earth. SI unit of weight is newton (N). Weight of a body varies from one place to another place on the Earth since it depends on the acceleration due to gravity of the Earth (g) weight of a body is more at the poles than at the equatorial region.
Example: Weight on Earth vs. The Moon
The value of acceleration due to gravity on the surface of the moon is 1.625 ms–2. This is about 0.1654 times the acceleration due to gravity of the Earth. If a person whose mass is 60 kg stands on the surface of Earth, his weight would be 588 N (W = mg = 60 × 9.8). If the same person goes to the surface of the Moon, he would weigh only 97.5 N (W = 60 × 1.625). But, his mass remains the same (60 kg) on both the Earth and the Moon.
Related Concepts: Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Context: 10th Science : Chapter 1 : Laws of Motion : Mass and Weight
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