Why some materials bounce off more than the others?

why some materials bounce off more than the others? What happens with the microstructure?
 

Astronuc

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why some materials bounce off more than the others? What happens with the microstructure?
In other words, why do some materials behave more elastically?

Materials have different levels of hardness.

Softer materials will experience plastic deformation at lower stress/load levels than others. There is always some permanent deformation at the contact surfaces.
 
And what is that free energy of the molecules?
 

Astronuc

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And what is that free energy of the molecules?
Please elaborate on your question about bouncing off and your use of free energy.

By free energy, does one mean Gibbs free energy?
 
I mean like (lets say) http://tbn0.google.com/images?q=tbn:VBuYtcLqM-o8rM:http://www.ukfitnesssupplies.co.uk/mall/UKFitnessSuppliesLtd/customerimages/products/PERFECTION.jpg" [Broken]
Why it bounces more than some wood or rock?
 
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Astronuc?
 

stewartcs

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