4.1 Hoekom het ons voedselverwerking nodig? We want to change existing materials into new, improved materials, for instance metal (steel) that won't rust like iron does, but has all the other desirable qualities of iron (strength and durability). Do you think they will be strong and durable? Add the melted butter to the batter and mix. In Picture 1 the clay is wet and soft. The jelly could also be set in small yogurt containers or ice cube trays so that each learner can enjoy it the next day! Here you could allow the learners to use their imaginations: Some materials that may be mentioned are: cement, stones, rocks, etc. ): Do not use words like good, bad, tasty, funny or weird! What evidence do we have of it still existing? Process (verb): To process material means to combine or mix it with other materials and/or to change it into something new by subjecting it to one or more processes (heating, cooling, firing, melting, pressurising etc.). When we process materials, the new materials may have different properties. Place the flour and water in separate bowls and allow learners to put their hands in to describe the properties. Real bricks are actually made by firing the bricks in a special oven called a kiln to bake them and make them hard. The people at Process Materials understand the company’s future rests on instilling ethical values and a positive culture. Can you see the steel bars that are sticking up into the sky? A permanent marker will come in useful when marking the level of the plaster of Paris in the tub. Inter state form of sales tax income tax? The stones were mixed into the concrete when it was still wet. and "When do things get warm?" That is what the next activity is all about. When these bricks are dry, they will be 'concrete' bricks. You should space the scoops of batter so they don't touch each other. Examine both types of bricks and write your observations is the table below. The same egg looks quite different when it is cooked. 5.2 Lewende en nie-lewende dinge in ekosisteme, 2.2 Goeie elektriese geleiers en isolators, 3.2 Wees 'n elektriese ingenieur of 'n tegnikus, 4.2 Voertuie wat op die maan gebruik word, 4.3 Ontwerp en maak 'n voertuig om rotse op die maan te The jelly powder has been processed into something new! Tom decides to invite 4 more friends to eat flapjacks. There are many ways to process existing materials into new materials. But what is stainless steel? What do they taste like? It may also be more hygienic to set a small portion of the dry jelly aside for the students to touch and taste, rather than have them dipping their fingers in the powder that will be made into jelly. He is very careful not to waste any of the batter. It may also be more hygienic to set a small portion of the ingredients, and of the raw batter aside for the students to touch and taste, rather than have them dipping their fingers in the materials beforehand. But it is also brittle as if you drop it on the floor it will smash. In Section 2.4, the nominal materials development process for propulsion materials is described. Dependent on the consistency of the paste that is made - it could be more like a liquid if there is more water, or it could be more like a solid if there is more flour. Draw a flow diagram to explain how you made the flapjacks from the starting materials. When we bake a cake, we are processing flour, eggs and other ingredients (that may not taste very nice on their own) into cake which tastes really good! The sand and plaster of Paris bricks should turn out stronger than the bricks made of sand alone, and therefore learners may respond: The bricks made of sand and plaster of Paris were stronger than the sand bricks. What do they look like? Can you think of other materials that we could add to the mixture of sand and plaster of Paris to make the bricks even stronger and tougher? Name a few places where bricks are used. Place a little bit of each ingredient on your tongue. Try to use as many of the following words as possible in your paragraph: investigation, powder, powdery, sand, water, disappear, colour, change, mixture, stiff. Have you ever noticed rust on the knives and forks in your home? (Hint: Why would the garage floor need to be extra strong?).