Lesson Notes By Weeks and Term v5 - Grade 4

Lesson Video

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Performance objectives

• Define 'processing' and give examples.
• Identify different processing methods like cutting, mixing, and heating.
• Describe the steps to make a simple product.
• Tell the difference between raw and processed materials.
• Explain why processing is important.

Lesson summary

Processing materials is a very important part of our daily lives in South Africa.

Think about it: the food we eat, the clothes we wear, the houses we live in – everything has been processed in some way from raw materials found in nature. From maize being ground into mealie meal to oranges being juiced for juice boxes, understanding how things are made helps us appreciate the effort and technology involved. Knowing how to process materials also allows us to be creative and resourceful, potentially even starting our own small businesses one day, making things like beaded jewelry or recycled art.

Lesson notes

What is Processing? Processing means changing a raw material into something more useful or desirable. A raw material is something found in its natural state that hasn't been changed yet. For example, maize kernels are a raw material. Processing turns them into mealie meal, which we use to make pap. Processing involves using different methods and techniques to alter the raw material's form, properties, or appearance. It changes the raw material to create a processed material or a simple product. Think of it as taking something from nature and turning it into something we can use more easily.

Examples of Processing in South Africa: Maize to Mealie Meal: Farmers grow maize. The kernels are then dried, cleaned, and ground into mealie meal. This process changes the hard kernels into a soft powder that can be cooked into pap.

Sugar Cane to Sugar: Sugar cane is harvested and then crushed to extract the juice. This juice is then boiled and refined to remove impurities and crystallize the sugar.

Clay to Bricks: Clay is dug from the ground, mixed with water, shaped into bricks, and then baked in a kiln. This process hardens the clay and makes it strong enough to build houses.

Wool to Clothing: Sheep are sheared to collect wool. The wool is then cleaned, spun into yarn, and woven or knitted into fabrics. These fabrics are then used to make clothing.

Fruit to Juice: Fruits like oranges or mangoes are picked, washed, and then squeezed to extract the juice. The juice is then pasteurized (heated to kill germs) and packaged.

Different Processing Methods: There are many different methods used to process materials.

Here are some common ones: Cutting: Separating a material into smaller pieces using a sharp tool.

Example: Cutting wood to build a table.

Shaping: Changing the form of a material using tools or machines.

Example: Moulding clay into a pot or shaping metal into a spoon.

Mixing: Combining different materials to create a new product.

Example: Mixing flour, sugar, and eggs to make a cake.

Heating: Using heat to change the properties of a material.

Example: Cooking food, baking clay, or melting metal.

Cooling: Lowering the temperature to change the properties of a material.

Example: Freezing water to make ice, cooling metal after heating to harden it.

Grinding: Reducing a material to smaller particles using a mill or grinder.

Example: Grinding maize into mealie meal or coffee beans into coffee powder.

Drying: Removing moisture from a material.

Example: Drying clothes on a washing line, drying fruit to make dried fruit, drying wood to prevent warping.

Example: Making Peanut Butter (Detailed Steps): Raw Material: Raw peanuts.

Cleaning: The peanuts are cleaned to remove any dirt or debris.

Roasting: The peanuts are roasted in an oven to improve their flavor and make them easier to grind. Heating method.

Cooling: The roasted peanuts are cooled. Cooling method.

Grinding: The peanuts are ground into a smooth paste using a grinding machine. Grinding method.

Mixing (Optional): Salt and sugar (or honey) are mixed in to improve the flavor. Mixing method.

Packaging: The peanut butter is packaged into jars.

Processed Product: Peanut butter. Why is Processing Important? Processing makes materials more useful, safe, and convenient for us to use. It allows us to transform raw materials into products that meet our needs and wants. Without processing, we would have a much harder time getting the food, clothing, and shelter we need to survive. It also allows for preservation of food and other products. Guided Practice (With Solutions)

Question 1: Nomsa wants to make vetkoek. What are the raw materials she needs, and what processing methods will she use?

Solution: Raw Materials: Flour, yeast, water, sugar, salt, oil for frying.

Processing Methods: Mixing: Mixing the flour, yeast, water, sugar, and salt together to make dough.

Heating: Frying the dough in oil.

Shaping: Nomsa needs to shape the dough.

Commentary: This question tests the learner's understanding of raw materials and processing methods. It encourages them to think about a common food item and the steps involved in making it.* Question 2: List three raw materials and the processed products they become.

Solution: Raw Material: Cotton; Processed Product: Clothing (shirts, pants, etc.)

Raw Material: Milk; Processed Product: Cheese Raw Material: Grapes; Processed Product: Grape juice

Commentary: This question reinforces the difference between raw and processed materials. It also allows the learner to choose examples they are familiar with.* Question 3: Sipho wants to build a wooden toy car. What processing method will he most likely use to cut the wood into the right shapes?

Solution: Cutting. Sipho will likely use a saw or knife to cut the wood.

Commentary: This focuses on connecting a specific task (building something) with the appropriate processing method.* Independent Practice (Questions Only) Describe the steps involved in processing maize kernels into samp.