13 / 03 Monday Kaupapa: Measure and compare the energy content per gram of different foods.

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Presentation transcript:

13 / 03 Monday Kaupapa: Measure and compare the energy content per gram of different foods

Do you remember? What is the unit for Energy? Describe the energy transformation taking place in a hydroelectric dam Describe what is wrong in this sentence “there are many different methods of creating electrical energy”

Energy Transformations & Conservation of Energy Principle

Conservation of Energy Principle Energy cannot be created or used (destroyed). Energy can only be transferred or transformed. Therefore, the total amount of energy will always be conserved!

“Trust Physics!”

Pop Quiz: Why do we eat food? What type of energy is present in food?

Chemical Potential Energy in Food

Food has Chemical Potential Energy

Energy in Food Food has chemical potential energy. Everything needs energy to work or to survive. That is the primary reason for eating food – to get energy.

Practical – Energy content of Food Aim - To measure and compare the energy content per gram of different foods

What have we learnt today? What kind of energy is present in food? What is the unit for energy?