Scientific Models for Year 9

Scientific Models for Year 9

MODEL

A mathematical, conceptual or physical representation that describes, simplifies, clarifies or provides an explanation of the structure, workings or relationships within an object, system or idea. Models can provide a means of testing and predicting behaviour within limited conditions.

Convection and Conduction

• PW1Energy transfer through different mediums can be explained using wave and particle models. (ACSSU182)
• Students:

• a.explain, in terms of the particle model, the processes underlying convection and conduction of heat energy

Can you find 3 things wrong with this web page?

Podcast

Link to page http://www.schoolphysics.co.uk/age16-19/Relativity/text/Time_dilation/index.html

Hint there are two errors in the diagram and a small error in the equations given.  I will prepare a podcast soon on this.... but students really are unsettled if they have first invested time, then are a little confused and as a rule don't believe there are errors.

Space riddle

A space craft flies to the star nearest star that is 4 light years away, and takes 20 years in its own timeframe to reach there. It sends a live video of its 20 year journey back to earth. How long does this video play back on Earth?

There are a few more twists to get you thinking

Einstein 0.0

You need to understand this before you get into Special and General Relativity. Push parts of your body into the past and bring them back to the present.

Does light weigh anything?

Does light weigh anything?
If you put in on scales trapped between two mirrors the gravitational red shift as it moves from the bottom up to the top mirror will have a tiny effect on the recoil imparted to the mirrors , so yes.
My apologies for acceleration in m.s-1 rather than m.s-2

History of Acid 1 to 10

History of Acid 1 to 10
1. Aristotle
2. Becher
3. Priestly
4. Lavoisier
5. Lebig
6. Arrhenius
7. Bronsted-Lowry
8. Lewis

Hydrofluoric acid

Hydrofluoric acid - why is it a weak acid? Is it ionic or covalent?

Hydrogen Ions

Hydrogen ions have now electrons so are the Ninja's of the chemical world

Oxygen 2- ion

Oxygen ion requires deep understanding to get why it doesn't fly apart