MATH for today
Estimation is …
… finding a number that is close enough to the right answer.
- You are not trying to get the exact right answer
- What you want is something that is good enough (usually in a hurry!)
We estimate when we:
About how much does the bacon weigh?
About how many strips of bacon are inside?
About how wide and long is the raw bacon strip?
About how wide and long is the cooked bacon strip?
About how long to cook bacon starting with a cold skillet?
About how long to cook bacon with a preheated skillet?
Learning Goal: I can explain why things are made out of what they are made out of.
When choosing a material for an object, such as a frying pan or a guitar pick, we have to discuss the forces, environment and stress the object will operate under.
Look around at the objects around you. What are they made out of? Why are they made of this?
Match the objects with the materials below:
Fantastic Plastic Lab
Plastics are a group of materials that can look or feel different, but can all be molded into many shapes. The similarities and differences between different plastic products come down to the molecules they are made of. Plastics are all similar because they are all made up of molecules that are repeated over and over again in a chain, called a polymer. Polymers can be chains of one type of molecule, or chains of different types of molecules linked together in a regular pattern. In a polymer, a single repeat of the pattern of molecules is called a monomer (even if the polymer is made up of only one type of molecule).
Milk contains many molecules of a protein called casein. When milk is heated and combined with an acid, such as vinegar, the casein molecules unfold and reorganize into a long chain. Each casein molecule is a monomer and the chain of casein monomers is a polymer. The polymer can be scooped up and molded, which is why plastic made from milk is called casein plastic.