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Energy The ability to cause a change.

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Presentation transcript:

You have 5 minutes to do this Can you compare your answers to yesterday’s “energy circus” with answers from other groups. Who was correct?!? New Topic You have 5 minutes to do this

Last lesson Types of energy Law of conservation of energy Energy flow diagrams

What is Energy? “The capacity to do work” Not a very good definition!

Types of energy Energy can take many forms;

Heat Unlucky dog

Light

Sound

Kinetic (movement)

Electric

Chemical

Gravitational potential

Elastic/strain

Nuclear

Types of Energy Heat Chemical Light Gravitational Sound Elastic/strain Kinetic Nuclear Electric

Types of Energy Heat Chemical Light Gravitational Sound Elastic/strain Kinetic Nuclear Electric Stored/potential

The Law of Conservation of Energy Energy can be changed (transformed) from one type to another, but it can never be made or destroyed.

This means that the total amount of energy in the Universe stays the same!

Energy Flow diagrams We can write energy flow diagrams to show the energy changes that occur in a given situation. For example, when a car brakes, its kinetic energy is transformed into heat energy in the brakes. Kinetic heat

Today’s lesson Measuring the energy content of two fuels You will move to the next experiment at the appropriate signal.

Gather round Mr Porter

Energy Content of two fuels Initial mass (g) Final mass (g) Mass of fuel used (g) Initial temp of water (°C) Final temp of water (°C) Temp rise of water (°C) Energy released (J) Energy released per gram of fuel (J/g) Wax Ethanol Volume of water (cm3) x 4.2 x temp rise Energy ÷ mass Then write three sentences saying what you have discovered, and suggesting two ways the experiment could be improved.