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Description of x-ray diffraction with clear diagrams. Includes calculations.
How do you define a kilogram? An introduction to the standards set for mass measurement.
A short explanation of centre of mass with an interesting animation.
This site allows you to convert between a wide variety of mass unit.
How to calculate atomic, molecular and formula masses
Apply a driving force to a mass between two springs. This activity helps you understand natural and resonant frequencies. Subscription site but with 30 day free trial.
Simple exploration of the Einstein rest mass/energy equation. Part of a larger site which includes many definitions and links.
The site gives a practical demonstration of various mass suspended on a spring and how the equation of motion is calculated
A given volume V of any ideal gas will have the same number of molecules. The mass of the gas will then be proportional to the molecular mass.
A simple pendulum is one which can be considered to be a point mass suspended from a string or rod of negligible mass.
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