Lubricant - GCSE Physics Definition

In GCSE Physics, a lubricant is a substance used to reduce friction between two surfaces that are in contact with each other, making it easier for them to move smoothly. Lubricants can be in the form of oils, greases, or even solid materials, and they work by creating a thin barrier that separates the surfaces, thus minimising wear and tear. This reduction in friction not only makes machines more efficient by decreasing the amount of energy lost as heat, but also prolongs the lifespan of components, preventing damage and the need for frequent maintenance. In everyday applications, lubricants are essential in car engines, bicycle chains, and even human joints, helping to ensure smooth and efficient operation.