Students often get confused between the “+” symbol and the “->” (arrow) symbol when they’re asked to formulate the conversion of energy. In this post, I’ll be sharing an easy technique to help your child overcome this.
Just recently, a parent on our Parent Support Group asked us for help on a question on “Conversion of Energy“. Many students tend to get confused between the “+” symbol and the “->” (arrow) symbol when they’re asked to formulate the conversion of Energy.
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As such, in today’s post, I’ll be sharing an easy technique to help your child overcome this confusion.
The diagram below shows a manual compost mixer. It is used by farmers to mix soil and compost together before he uses it in his farm.
The farmer will pour the soil and compost into the barrel and turn the handle to mix them together.
Question (b): State the correct energy conversion that takes place when the farmer turns the handle.
The parent asked:
“May I know should the connectors among the 3 boxes on the right be “->” sign instead of “+”?”
The Technique: Look at the type of energy conversion
Is the conversion of energy a “main” energy conversion or a “side-effect”/ “by-product” energy conversion?
For example, if we are referring to a torch lighting up, we would state the conversion of energy in this format:
Chemical Potential Energy (Battery) –> Electrical Energy (Wires) –> Light Energy (Bulb) + Heat Energy (Bulb)
However, if we are referring to an oven, then the conversion of energy goes like this:
Electrical Energy (Mains Socket) –> Heat Energy (Oven) + Light Energy (Heating Element)
*You could also add in “+ Sound Energy” when the oven is operating
Looking At The Above Question…
The question is a little ambiguous! The answer can be interpreted as either:
Chemical Potential Energy (Hand/Food He Eats) –> Kinetic Energy (Handle) +Heat Energy (Barrel) + Sound Energy (Barrel)
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