Aim: - To revise what we have learnt so far using Into-Science. Forms of Energy:Convection, Conduction and Radiation: Energy Efficiency: Lesson Summary:
We revised: - forms of energy - conduction, convection and radiation - energy efficiency - energy transformations Aim: - To create Sankey Diagrams to describe energy transfers. Keywords: Transformation, Efficiency What is the difference between 'Energy Transformation' and 'Energy Transfer'? Energy Transformation: The change of one form of energy to another form of energy. Energy Transfer: The movement of one form of energy from place to place or from person to person. Focus question: How do we illustrate energy transformations? By using a type of diagrams called 'Sankey Diagrams', we can illustrate how the input energy is split among the different outputs. The proportions of the arrows in a Sankey Diagram demonstrate where the energy goes to whether it is useful or wasteful. The top diagram shows that of the 100J of energy going into the light bulb, 75J of energy comes out as light energy and 25J of energy gets wasted on heat energy. This means this light has an efficiency rating of 75% because 75% of the energy is used for productive purposes. On the diagram at the bottom, of the 100J of energy coming into the light bulb, only 10J comes out as light energy. The other 90J is wasted on heat energy. This gives this light an efficiency rating of 10% because 10% is used for productive purposes. In class we did some practise on drawing Sankey diagrams. Below are my Sankey diagram practise sheets where we had a example and we had to draw a diagram to match it. Lesson Summary:
- learnt about Sankey diagrams and practised drawing them. - learnt about energy transfer and transformation. - revised energy efficiency equation. Aim: - To describe what happens when energy is 'used'. Keywords: Energy, Kinetic, Potential, Heat, Light Using Energy: What happens to it? Energy can neither be created nor destroyed but it can transform between different types of energy. By looking at the sheet below we can see that when energy is put into an object, energy comes out. The energy that comes out has been converted into useful energy and non-useful energy. For example, when electricity energy is put into the electric mixer, kinetic energy comes out as useful energy. Heat and sound also come out as by products of creating the kinetic energy. By looking at the sheet below, we can see how potential gravitational energy works. As the cart moves along the roller coaster, we can see where the energy is used up. At the start of the roller coaster, the cart has maximum potential gravitational energy. This is because it is the highest point on the roller coaster. At the bottom of the hills there is maximum kinetic energy but when the cart starts to move up the track, it loses the kinetic energy due to air resistance and track friction. By the end of the run, the car has lost all of its kinetic energy because of the friction. By looking at this we can see that the gravitational energy has not disappeared, it has just transformed into heat energy due to the friction. Lesson Summary:
- learnt how to illustrate energy transformation - what happens to energy when we use it - how to calculate energy consumption efficiency (useful energy output divided by energy input multiplied by 100) Aim: To investigate how to make a cotton reel car move, using potential energy. Keywords: - Elastic potential energy Rubber poppers: When using the rubber poppers, we found that if we held the poppers in their position for longer, when we let go they would pop after a few seconds. When they popped back into their starting position, the elastic energy that was stored was released and that sent the popper flying into the air. Cotton reel cars:
When using the cotton reel cars we found that the tighter we wound the rubber band, the longer and faster the car moved for. This is because the tighter the rubber band is wound, the more elastic potential energy is stored. Lesson Summary: - learnt how elastic potential energy is created and how it is released to make things move. Aim: - To distinguish between the forms of energy and sources of energy. - To classify the different forms of energy Keywords: Kinetic, Potential Focus question: What is energy? “Energy is the ability to do work (to make change happen)” We can describe sources of energy or forms of energy: Source: Where we get the energy from such as the sun, coal, oil and wind. Forms: The kind of energy that we can observe such as light, heat and movement. Classifying Energy types: Energy can be sorted into two main categories:
There are also lots of sub-categories:
Lesson Summary: - learnt about kinetic energy, potential energy, forms and sources and what their differences are. - worked on our blogs and finalised the presentation of them. - figured out our roles for the week. |
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