some use magnets others use lubricants such as oil and grease
If I'm not mistaken, there is no machine that can reduce friction. The machine is intended to change the distance the input force is applied over or to multiply the output force. The moving parts of the machine will always increase friction. In order to reduce the extra friction (but not completely remove it), one would use a lubricant or reduce the roughness between two surfaces. Hope it helps.
ligament
they reduse the friction between the machine parts.
a "lubricant" is a friction-reducing substance: a substance, typically oil or grease, applied to a surface to reduce friction between moving parts
Sliding friction (aka dry kinetic friction) between 2 surfaces, is caused due to chemical bonding between the surfaces.
If I'm not mistaken, there is no machine that can reduce friction. The machine is intended to change the distance the input force is applied over or to multiply the output force. The moving parts of the machine will always increase friction. In order to reduce the extra friction (but not completely remove it), one would use a lubricant or reduce the roughness between two surfaces. Hope it helps.
I think it would a lubricant not a part...
Machine parts use ball bearings to reduce friction, making it easier to move the moving parts and producing less wear on the parts.
to reduce friction
to reduce friction between the parts of a car
It's to reduce friction (and thus heat) generated while the machine's parts are moving.
Oil and grease can reduce the amount of friction, making it easier for parts to slide against one another, and reducing the amount of heat produced.
Ideal Machine
Ideal Machine
Grease and oil is used in machinery to prevent the moving parts from wearing out too soon due to friction.
ligament
By reducin friction between the machine parts and also by avoiding any sorts of power losses.