L2 - Energy Transformation

objectives

Conservation of Energy

• To do work, you have to spend energy.
• But, like money, energy doesn't vanish when you spend it. It goes somewhere else!
• People talk about 'using energy’, but energy is never used up. It just changes into different forms, as in the example below.
• A stone Is thrown upwards:

• When energy changes from one form to another, scientists say that energy is transformed.
• The diagram above show's a sequence of energy transformations.
• The last one is from kinetic energy into thermal energy (heat).
• When the stone hits the ground, it makes the atoms and molecules in the stone and the ground move faster, so the materials warm up a little.
• During each transformation, the total amount of energy stays the same.
• This is an example of the law of conservation of energy:

The Law of Conservation of energy states 'Energy cannot be made or destroyed, but it can change from one form to another'

Wasting Energy

Sankey Diagrams

Work Done and Energy Transformed