An Overview of Cbse Class 3 Maths Notes Chapter 8 Who Is Heavier
Weight
Weight is the amount or quantity of heaviness or mass.
The more the weight an object has heavier it is and vice versa.
Example: 1 kg of oranges is less heavy than 3 kg of oranges.
Measurement of Weight
The weight of objects is normally measured in Kilograms.
Simply, Kilograms can be represented as “kg”.
Weights of Smaller objects are measured in Grams(g) and Milligrams(mg).
1 Milligram(mg) is less heavy than 1 Gram(g) and 1 Gram(g) is less heavy than 1 Kilogram(kg).
Weight and Size
If the weight of two quantities is the same, it is not always necessary that the size and shape of those two quantities are also the same.
Example: Take 1 Kg Sugar and 1 Kg Popcorn. 1 Kg popcorn needs a larger bag when compared to 1 Kg Sugar bag.
This is because Popcorn is lighter than sugar.
Comparison of size of 1kg popcorn and 1kg sugar
The size of objects does not always decide the weight.
Example: The weight of an air-filled balloon is less than the weight of a small orange. (although their size appears the same)
Observation of weight comparison of a balloon and an orange
Solved Example 1: An elephant weighs 120 kg and a tiger weighs 100 kg. Which one is heavier and why?
Ans: An elephant weighs more than a tiger therefore, the elephant is heavier than the tiger.
Solved Example 2: A watermelon weighs 6 kg and a mango weighs 1/2 kg. Which one is heavier and why? Also is it always true that an object which is bigger in size is heavier?
A watermelon and a mango
Ans: A watermelon weighs more than a mango therefore, the watermelon is heavier than the mango.
In this case, heavier fruit is bigger in size than smaller fruit.
No, it's not always true that a heavier object is bigger than a lighter object. Consider a packet of 1 kg of popcorn and 2 kg of an iron rod. The size of the popcorn packet will be more than the size of the iron rod but its weight will be less than the iron rod.
Weights
We use standard weights like 1kg, and 500 gm to measure the weight of other objects using balances.
Weights of 1kg and 500 gm
Example: To measure the weight of 5 kg we can use five 1 kg weights or ten 500 grams weights to balance on the scale.
Solved Example 1: How many weights of 1 kg will be required to balance the weight of a 10 kg object?
Ans: We need ten 1 kg weights to balance the weight of the 10 kg object.
Scales
We use scales to measure the weight of an object.
There are different kinds of scales as shown in the below figure.
Different scales to measure weight
Which kind of scale we should use depends on the amount of weight and the purpose of weighing.
Example: A spring scale is used to measure the weight of a gas cylinder and bathroom scales are used to measure the weight of a person.
Balance Scale
Balance is a weighing device.
It has a balanced beam as well as two pans.
To determine the weight of an object, place it in one pan and standard weights in the other.
An object which is heavier comes lower.
A weight balance showing heavier and lighter sides
The beam is in balance when the pans have the same weight.
A measure of equal weight on both sides of balance
Example: In the above image weight of fruits is 2kg as the beam is balanced.
Solved Example 1: Using the below image, explain which fruit is heavier.
Weight comparison of two fruits: pear and peach
Ans: Clearly Peach is heavier than Pear, as Peach is on the lower side.
Practical applications of weights and balance
When you buy fruits/vegetables from the market, the vendor uses balance to give the desired amount of fruits/vegetables.
In order to weigh domestic gas cylinders, the use of a spring scale is very popular.
Kitchen scales are used to weigh the number of particular components used in a recipe.
Practice Question:
Q 1: The weight of a soft toy (made of cotton) is 1 kg whereas the weight of a car toy (made of steel) is 3 kg. Which one is heavier? Also, guess which is bigger in size.
Q 2: A steel chair weighs 15 kg and a wooden bed also weighs 15 kg. Comment on their sizes. (does equal weight implies their size will be the same).
Q 3: Which scale will you use to measure the weight of the gas cylinder?
Q 4: How many weights of 1 kg will be required to balance the weight of a 6 kg object?
Answers:
Ans1. A steel car of 3 kg is heavier than a soft toy of 1 kg. There are high chances that soft toys will be bigger than cars as cotton is lighter than steel.
Ans2. Their size and shape can be different as they are made of different materials and for different use.
Ans3. A spring scale will be used to measure the weight of the gas cylinder.
Ans4. Six weights of 1 kg will be required.
Why CBSE Class 3 Maths Chapter 8 Who is Heavier Importnat For Students?
This chapter, as mentioned earlier, introduces a new concept of weights. Students will learn to judge the weights of daily objects and compare them. The real-life examples are compiled in the form of real-life stories to make learning more fascinating. Here is why this chapter is important for the Class 4 students.
Stories using gur and groundnuts help students realise the difference in weights of daily objects. It grows a sense of comparison between these objects. It leads the students to realise which is heavier than what.
They will also learn to balance the weights on both sides of a see-saw using simple examples. They will use the concept of heavy and light weights for balancing activities.
They will also take the first step of figuring out that objects with the same weight are actually equal to each other.
The exercise questions also ask students to make guesses to check their imagination and logical reasoning power.
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Importance of CBSE Class 3 Maths Chapter 8 Who is Heavier Revision Notes
The revision notes designed by the experts will ensure that students can grab hold of the concepts and mathematical principles related to the weights of objects well. By understanding these concepts and formulas, students will be able to use them to solve exercise problems without any hassle.
To make this process easier, the notes have been formulated in a simpler and more organized version. It will enable students to focus on the prime topics and revise the chapter faster. Hence, add these notes to the study material and take your preparation to the next level.
Advantages of CBSE Class 3 Maths Chapter 8 Who is Heavier Revision Notes
Get a consolidated file of revision notes here and access it whenever you want. You can also download the PDF version of these notes and make your study sessions more convenient.
Resolve doubts related to the concepts of this chapter by using these notes and preparing them well.
Follow the process of explaining the concepts and principles of weight in these notes to learn how to compile correct answers.
Reduce the revision time before an exam by using these notes and then practice solving the exercise problems.
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Get the free PDF version of these notes and complete your study material. Refer to these notes according to your study and revision schedules. Use the simpler description of the concepts to understand the context of this chapter well. Utilise the organised format of these notes to recall what you have studied perfectly during an exam.
Study Materials for CBSE Class 3 Maths
FAQs on Cbse Class 3 Maths Notes Chapter 8 Who Is Heavier
1. What is the main concept to revise in the CBSE Class 3 Maths chapter, 'Who Is Heavier?'
This chapter introduces the concept of weight. The main idea is to learn how to compare objects and determine which one is heavier (weighs more) and which one is lighter (weighs less). You will also learn about the standard units for measuring weight, which are grams and kilograms.
2. How can we tell which object is heavier using a simple balance or a seesaw?
When you place two objects on a simple balance (like a seesaw), the side that goes down holds the heavier object. The side that goes up holds the lighter object. If both sides stay at the same level, it means the objects have equal weight.
3. What are grams (g) and kilograms (kg), and how are they used in this chapter?
Grams (g) and kilograms (kg) are standard units for measuring weight. We use them to know exactly how heavy something is.
- Grams (g) are used for lighter items like a pencil, a chocolate bar, or a small toy.
- Kilograms (kg) are used for heavier items like a bag of sugar, a school bag, or a pumpkin.
4. Why is it better to use standard units like grams and kilograms instead of non-standard units like stones or marbles?
Using non-standard units like stones can be confusing because not all stones have the same weight. A stone you use might be heavier than a stone your friend uses. Standard units like grams (g) and kilograms (kg) are fixed and the same everywhere. This ensures that everyone measures weight accurately and gets the same result.
5. Is a bigger object always heavier than a smaller one? Explain with an example.
No, a bigger object is not always heavier. The weight of an object depends on the material it is made of, not just its size. For example, a large, inflated balloon is much bigger than a small cricket ball, but the cricket ball is much heavier because it is made of denser material.
6. How do you solve problems that involve adding or subtracting weights?
To add or subtract weights, you must first make sure they are in the same unit. For example, to add 2 kg and 500 g, you can convert kilograms to grams (2 kg = 2000 g) and then add them together (2000 g + 500 g = 2500 g). You perform the addition or subtraction just like you do with regular numbers.
7. How can you estimate the weight of an object by holding it?
You can estimate weight by comparing it to an object whose weight you already know. For example, hold a 1 kg bag of sugar in one hand and the object you want to estimate in the other. This helps you guess if the object is heavier than, lighter than, or about the same as 1 kg. This is a quick way to get a rough idea of an object's weight.
