Are the Material Properties in My Physics Library Accurate?

In summary, the conversation is about developing an application with a physics library and pre-setting materials with various properties such as density, friction, and restitution. The reliability of this information is questioned and references are provided for further review. It is noted that the coefficients of friction and restitution are not intrinsic properties and may vary depending on external factors. The accuracy of the properties for wood is also mentioned to vary greatly depending on the species.
  • #1
RicardoTk
2
0
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!
 
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  • #2
I can't tell you if these values are correct, but the coefficient of friction and (probably) the coefficient of restitution are not intrinsic properties of the materials. Think about it, the same rubber tires will stop in a shorter distance on dry asphalt than on wet, and a basketball will bounce higher on cement than on shag carpeting.
 
  • #3
How accurate do they need to be because the properties for wood vary by a factor of at least 2 depending on species.
 
  • #4
Thank you guys! :cool:
 
  • #5


I would recommend that you always double-check your sources and make sure they are reputable and reliable. It's important to use accurate and up-to-date information when working with materials properties, as these can greatly impact the behavior and performance of your application.

That being said, the properties listed for each material seem reasonable and consistent with what is commonly known about them. For example, wood is known to have a lower density and higher restitution compared to iron, which is a denser and more rigid material.

However, it's also important to note that these properties can vary depending on the specific type and quality of the material. For instance, the density of wood can vary depending on the type of tree and how it was processed. So it may be helpful to specify the type or source of the materials you are using in your application.

Overall, it's always a good idea to verify and validate your data and sources to ensure the accuracy and reliability of your work. Keep up the good work and happy coding!
 

1. What is the difference between physical and chemical properties of materials?

Physical properties of materials are characteristics that can be observed or measured without changing the substance's composition. Examples include color, density, and melting point. Chemical properties, on the other hand, describe how a substance reacts with other substances to form new substances. Examples include flammability and reactivity.

2. How are materials classified based on their properties?

Materials can be classified based on their physical and chemical properties, as well as their mechanical, thermal, and electrical properties. These classifications help scientists and engineers choose the right material for a specific application.

3. What is the importance of understanding materials properties in product design?

Understanding materials properties is crucial in product design as it allows engineers to select the most suitable materials for a specific product. This ensures that the product will have the desired properties and perform well under different conditions, increasing its durability and functionality.

4. How are materials properties tested and measured?

Materials properties can be tested and measured using various techniques, including mechanical testing, such as tensile and compression tests, thermal analysis, such as differential scanning calorimetry, and spectroscopy, such as infrared spectroscopy. These tests provide valuable information about a material's physical, chemical, and mechanical properties.

5. How do materials properties change under different environmental conditions?

Materials properties can change under different environmental conditions, such as temperature, pressure, and humidity. For example, metals may expand or contract with changes in temperature, while polymers may become brittle in cold temperatures. These changes can affect a material's performance and should be considered in product design and selection.

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