Presentation on theme: "New Topic Can you compare your answers to yesterdays energy circus with answers from other groups. Who was correct?!? You have 5 minutes to do this."— Presentation transcript:
New Topic Can you compare your answers to yesterdays energy circus with answers from other groups. Who was correct?!? 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
Types of Energy HeatChemical LightGravitational SoundElastic/strain KineticNuclear Electric
Types of Energy HeatChemical LightGravitational SoundElastic/strain KineticNuclear 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. Kineticheat
Todays 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 FuelInitial 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 (cm 3 ) 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.