The document summarizes the NPL Academy 2016 activities where Joshua Bayfield and Emily Mason welcomed participants to the National Physical Laboratory. They used impulse excitation to find the density and modulus of elasticity of metal bars through three different methods, achieving over 99% accuracy. They also tested a bar hit from the side. Later activities included water rockets and acknowledgements were given.
6. Modulus of Elasticity
We first found the density from the mass and volume of the
bars.
We used three different methods to find out the Modulus of
Elasticity.
We were over 99% accurate to the actual value, which is
around 70GPa (Giga-Pascals)
The three methods we used were:
• The value from the length, density, frequency and
thickness
• The graph slope, thickness and density
• The density, frequency and length on a bar which was
hit from it’s side (instead of in the middle).
