Starter Answer the following questions. Where do humans get energy? What type of energy is this? What do we use the energy for?

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Presentation transcript:

Starter Answer the following questions. Where do humans get energy? What type of energy is this? What do we use the energy for?

Energy L2: Energy for Living Learning Objectives: 1.Recall that food is fuel for living things. 2.Calculate energy stored in food using food labels. 3.Explain the differences in energy requirements for different people.

1. Living things get energy from food Food is a fuel and stores chemical energy. We use this energy for all life processes such as… Growth/repair Moving our muscles (the heart and lungs also have muscles that move!) Keeping warm

2. Energy is measured in Joules (J) or Kilojoules (kJ) 1 kJ = 1000 J Different foods contain different amounts of energy. Food labels contain information about how much energy is in the food.

3. Food Labels This is the amount in one serving. Serving = typical amount you would eat This is the amount in 100g of the food. This is so that you can easily compare different foods.

Complete the worksheet on food labels

Analysing Food Labels Questions 1aWhich food releases the most energy? bWhy do you think this food releases the most energy? (Hint: Look at how many grams of different things are in 100 g of each food.) 2aWhich food releases the least energy? bWhy do you think this food releases the least energy? (Hint: Look at how many grams of different things are in 100 g of each food.) 3Have a look at the food label for the food that releases the most energy. Use the other information on the label to try to suggest which component of the food is responsible for releasing the energy. 4Extension: What might be a problem with comparing energy in 100g for all foods?

4. Energy requirements Every cell of your body uses energy. Different people need different amounts of energy (energy requirements). What factors cause people to have different energy requirements? Age Gender Genes Health/Fitness Amount of Activity/Exercise

5. Who uses more energy? For the following examples state which person uses more energy and explain why.

Baby vs Adult

Boys vs Girls

Office Worker vs Football Player

Woman vs Pregnant Woman

Adult Man vs Elderly Man