A whole lesson to teach problem-solving, practical technique & data processing to new A-level students.
You have a metre ruler.
You have a 100g mass.
Nothing else.
Your mission is to determine the mass of the metre ruler.
(Hint - principle of moments)
The powerpoint walks the class through how to do it, how to get reliable results rather than just make one measurement and then claim that you’ve done it, how to use graphical techniques to get those reliable results, and how to calculate the uncertainties.
Adapted from an idea I heard on https://twitter.com/physicstp
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