Greases

Greases are semi-solid lubricants that are used to reduce friction and wear between moving parts. They are typically composed of a base oil, thickening agent, and various additives. Greases are commonly used in automotive, industrial, and household applications to lubricate bearings, gears, and other mechanical components.

Composition

Base Oil: Greases are typically made from mineral oil, synthetic oil, or a combination of both. The base oil provides lubrication and carries the additives throughout the grease.
Thickening Agent: This component gives the grease its semi-solid consistency and determines its dropping point, which is the temperature at which the grease becomes fluid.
Additives: Various additives such as anti-wear agents, rust inhibitors, and extreme pressure additives are included to enhance the performance and longevity of the grease.

Properties

Greases offer several key properties that make them suitable for lubrication:

Adhesion: Greases adhere well to metal surfaces, providing long-lasting lubrication even in high-stress conditions.
Viscosity: The viscosity of greases can be tailored to specific applications, allowing for effective lubrication under a wide range of operating conditions.
Water Resistance: Many greases are formulated to repel water and prevent corrosion, making them ideal for outdoor and marine applications.

Application

When applying grease, it's important to consider the following factors:

Compatibility: Ensure that the grease is compatible with the materials and operating conditions of the application.
Quantity: Apply the appropriate amount of grease to ensure proper lubrication without causing excessive buildup or waste.
Re-Lubrication: Establish a regular re-lubrication schedule to maintain the performance and lifespan of the components.

Study Guide

To effectively study the topic of greases, consider the following points:

Learn about the composition of greases, including the role of base oils, thickening agents, and additives.
Understand the key properties of greases and how they contribute to effective lubrication.
Explore the various applications of greases in automotive, industrial, and household settings.
Study the proper techniques for applying and re-lubricating components with grease.

By mastering these aspects of greases, you will develop a comprehensive understanding of their role in mechanical lubrication and maintenance.

◂Physics Worksheets and Study Guides High School. Thermodynamics

The resources above cover the following skills:

PHYSICAL SCIENCE (NGSS)

Matter and Its Interactions

Students who demonstrate understanding can:

Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.

Energy

Students who demonstrate understanding can:

Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known.

Plan and conduct an investigation to provide evidence that the transfer of thermal energy when two components of different temperature are combined within a closed system results in a more uniform energy distribution among the components in the system (second law of thermodynamics).