Different materials have properties that are desirable or undesirable for use in an artifical joint.
Desirable (D)l Undesirable (UD) l Not Revelant (NR)
1.Chemically Stable (D)
2.Atoms can roll over each other (NR)
3.Consists of long molecules (UD)
4.Tightly packed atoms or molecules (UD)
5.Electrons flow freely between atoms (D)
6.Loosely packed atoms or molecules (D)
7*Free electrons vibrate in contact with light (NR)
Is this correct?
3.Consists of long molecules . High density polymers are being successfully used already in joint.
I dont know what "roll over" means when applied to atoms, that is something I have never seen.
Yes, your classification of the properties of different materials for use in an artificial joint is mostly correct. Here's a breakdown of each property:
1. Chemically Stable (Desirable - D): This property is important for an artificial joint because it ensures that the material will not react or degrade when exposed to bodily fluids or other chemical substances in the body.
2. Atoms can roll over each other (Not Relevant - NR): This property refers to the ability of atoms to slide or move past each other easily, which is generally not a relevant consideration for materials used in artificial joints.
3. Consists of long molecules (Undesirable - UD): Materials with long molecules tend to have lower strength and mechanical properties, making them less desirable for use in artificial joints that require durability and resilience.
4. Tightly packed atoms or molecules (Undesirable - UD): Materials with tightly packed atoms or molecules may be too rigid or inflexible, which is not ideal for artificial joints that require some degree of flexibility and range of motion.
5. Electrons flow freely between atoms (Desirable - D): This property, known as electrical conductivity, is desirable in certain types of artificial joints that utilize electronic components, such as sensors or actuators.
6. Loosely packed atoms or molecules (Desirable - D): Materials with loosely packed atoms or molecules often exhibit good mechanical properties like resilience and the ability to absorb impact, which is beneficial for artificial joints.
7. Free electrons vibrate in contact with light (Not Relevant - NR): This property pertains to the interaction of electrons with light and is unrelated to the characteristics required for materials used in artificial joints.
Overall, you correctly identified the desirable properties as chemically stable, electrons flowing freely between atoms, and loosely packed atoms or molecules. However, the undesirable property should be the presence of long molecules and tightly packed atoms or molecules rather than just long molecules. Finally, the property related to the vibration of free electrons in contact with light is considered not relevant.