Oil reduces friction because it acts as a lubricant, smoothing and cushioning bumps between rough surfaces while also flowing past itself in parallel layers. This second form of lubrication, in which oil moves in multiple directions simultaneously, is referred to as laminar flow.Continue Reading
Different layers of oil tend to move in the same direction with the nearest surface. As a result, one surface moving out of sync with another is able to slide by freely.
By helping moving parts operate smoothly, oil enables machinery to work with less effort, saving energy. It also decreases the wear and tear on their mechanisms, extending the lives of their mechanical components. Both of these effects contribute to lower overall operating costs.Learn more about Motion & Mechanics
Friction can be reduced by adding a lubricant or by smoothing and polishing surfaces, according to the HyperPhysics program at Georgia State University. For some substances, smoothing only reduces friction to a point, after which friction increases with further smoothing.Full Answer >
Static friction is the resistance to movement when two non-moving solid objects are in contact with each other. Static friction matches applied force and prevents motion. When the applied force overcomes static friction, the object starts moving, and at this point, static friction ceases and kinetic friction comes into play.Full Answer >
Ideal mechanical advantage is the force multiplication of a simple machine in the hypothetical absence of friction and deformation. The formulae for ideal mechanical advantage assume perfect component rigidity and hardness and an absence of friction.Full Answer >
Air resistance is the friction that objects experience as they move through an atmosphere made up of air. Air is made up of relatively widely spaced particles in the form of molecules and atoms. These minute particles, en masse, must be pushed against for any object to move.Full Answer >