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Clothes—How Things are Made - Weaving and Patterns with Threads

Grade 5CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Fabric is made from thin strands called yarns, which are further made up of even thinner strands called fibers. This can be represented as: Fiber→Yarn→FabricFiber \rightarrow Yarn \rightarrow Fabric.

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Spinning is the process of making yarn from fibers. In this process, fibers from a mass of cotton wool are drawn out and twisted, which brings the fibers together to form a strong yarn.

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Weaving is the process of arranging two sets of yarns together at right angles to make a fabric. The two sets are called the warp and the weft.

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The Warp threads are those that run vertically (lengthwise) on the loom, while the Weft threads are those that run horizontally (crosswise) and are woven through the warp.

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A Loom is the device used for weaving fabric. It can be a handloom (operated by hand) or a powerloom (operated by machines/electricity).

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Knitting is a different method where a single yarn is used to make a piece of fabric by creating interlocking loops using needles or machines.

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Patterns in clothes are created by using yarns of different colors or by changing the sequence in which the weft passes over and under the warp threads.

📐Formulae

Fiber→SpinningYarn→Weaving/KnittingFabricFiber \xrightarrow{Spinning} Yarn \xrightarrow{Weaving/Knitting} Fabric

Warp⊥Weft=90∘Warp \perp Weft = 90^\circ

Total Threads=Number of Warp threads+Number of Weft threads\text{Total Threads} = \text{Number of Warp threads} + \text{Number of Weft threads}

💡Examples

Problem 1:

A weaver wants to create a square piece of cloth. If he uses 5050 warp threads and 5050 weft threads, and each thread is 1010 cm long, what is the total length of yarn used?

Solution:

Total Length=(50×10)+(50×10)=500+500=1000 cmTotal\ Length = (50 \times 10) + (50 \times 10) = 500 + 500 = 1000\text{ cm}

Explanation:

To find the total yarn, we add the total length of the warp threads to the total length of the weft threads. Total warp length is 50×1050 \times 10 and total weft length is 50×1050 \times 10.

Problem 2:

Explain the difference between weaving and knitting based on the number of yarns used.

Solution:

In weaving, we use 22 sets of yarns (Warp and Weft). In knitting, typically 11 continuous yarn is used.

Explanation:

Weaving requires interlacing two distinct sets of threads at right angles, whereas knitting involves looping a single strand of yarn into itself.

Problem 3:

Calculate the number of intersections in a simple weave pattern that has 1010 warp threads and 1010 weft threads.

Solution:

Intersections=Warp×Weft=10×10=100Intersections = Warp \times Weft = 10 \times 10 = 100

Explanation:

In a basic weave, every weft thread crosses over every warp thread. Therefore, the number of contact points or intersections is the product of the number of threads in both sets.