Why some materials bounce off more than the others?

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The discussion centers on the varying elastic properties of materials and why some bounce more than others. Key factors include the hardness of the materials, where softer materials tend to undergo plastic deformation under lower stress, leading to permanent changes at contact surfaces. The concept of free energy, particularly Gibbs free energy, is mentioned in relation to the molecular behavior during impact. The elasticity of a material is crucial in determining its bounce; materials with higher elastic properties will rebound more effectively. The conversation also touches on specific examples, such as the comparison of different materials like wood and rock, highlighting their differing responses to stress and impact.
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why some materials bounce off more than the others? What happens with the microstructure?
 
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Physicsissuef said:
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?
 
Physicsissuef said:
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"
Why it bounces more than some wood or rock?
 
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Astronuc?
 
Physicsissuef said:
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"
Why it bounces more than some wood or rock?

Like Astronuc said, they 'bounce' due to their elastic properties...

http://www.exploratorium.edu/sports/ball_bounces/ballbounces2.html

CS
 
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Physicsissuef said:
And what is that 5 1/8 on the article?

The weight of the baseball like the article says.

CS
 

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