0.2 Identify how and why materials are selected with low frictio

Why is low friction desirable in machine components?

• It reduces wear and tear

• It increases heat generation

• It improves load-bearing capacity

• It enhances stiffness

Which property of a material contributes to its ability to exhibit low friction?

• High thermal conductivity

• High coefficient of friction

• Smooth surface finish

• High density

What is a common application where low-friction materials are crucial for efficient operation?

• Brake pads in cars

• Lumber construction

• Building foundations

• Cooking utensils

Which type of lubrication mechanism can help reduce friction between moving parts?

• Adhesive lubrication

• Cohesive lubrication

• Hydrodynamic lubrication

• Static lubrication

Which of the following materials is commonly chosen for low-friction applications due to its self-lubricating properties?

• Stainless steel

• Aluminum

• Bronze

• Glass

In bearing applications, low-friction materials are preferred to reduce:

• Load capacity

• Vibration

• Lubrication

• Wear and energy loss

What is the term for the resistance a material offers to being slid or rolled over another material?

• Hardness

• Friction

• Elasticity

• Ductility

Why is Teflon often used in applications where low friction is crucial?

• It has a high coefficient of friction

• It is chemically inert and has a low friction coefficient

• It is a dense material

• It is a good conductor of electricity

Which property is associated with low friction in polymers used for bearings and bushings?

• High modulus of elasticity

• Low tensile strength

• Low coefficient of thermal expansion

• High coefficient of friction

What is the benefit of using lubrication in machinery?

• It reduces wear and tear

• It increases friction

• It causes corrosion

• It enhances noise