Some materials properties

[RicardoTk]

Hi everyone!

Im developing an application with a physics library.

In the application I pre-setted some materials with the following properties,

Density, Friction and Restitution

Im not sure if this informations are truly trustable,

Can you guys just review this for me?

===|Wood|==
Density: 680 kg/m³
Friction: 0.4
Restitution: 0.7

===|Iron|==
Density: 7400 kg/m³
Friction: 1 (Steel = 0.8 )
Restitution: 0.85

===|Concrete|==
Density: 2300 kg/m³
Friction: 0.65
Restitution: 0.75

===|Rubber|==
Density: 920 kg/m³
Friction: 0.75
Restitution: 0.3

===|Polystyrene|==
Density: 80 kg/m³
Friction: 0.5
Restitution: 0.5

===|Plastic|==
Density: 1300 kg/m³
Friction: 0.35
Restitution: 0.6

References:
http://www.matbase.com/
http://www.matweb.com/
http://physics.info/density/
http://www.bulletphysics.org/Bullet/php ... ?f=9&t=616
http://www.woodweb.com/knowledge_base/W ... dbook.html
http://www.engineershandbook.com/Tables ... cients.htm
http://www.engineeringtoolbox.com/frict ... d_778.html
http://hypertextbook.com/facts/2006/restitution.shtml

Thanks!

[twistor]

Why would we know better than your references?

[RicardoTk]

I don't know, the values seems a little strange for me,

Maybe you guys can tell me something more =/

For example the Concrete density:

2300 kg/m³

One object 1m³ of concrete has 2.3T??

Or the Iron density:

7400 kg/m³

One object 1m³ of iron has 7.4T??

This values make sense to you?

Thanks!

[bfollinprm]

The iron one looks right (a cubic meter of iron is an outrageous amount). No idea on the concrete, but I'd trust your source.

[kangaroo]

Some people weigh 0.1 metric tons (100 kg), and a human definitely does not have 1 m^3 of volume. 1 m^3 of concrete definitely can be over 2 tonnes. Think about it this way: 1 m^3 of air weighs around 1 kg. You would not have thought that would you?

[RicardoTk]

Thank you guys!