It's to reduce friction (and thus heat) generated while the machine's parts are moving.
== == It is a substance, as oil or grease, that reduces friction when applied as a surface coating to moving or working parts of a mechanism.
The grease is there to lessen friction between two metal parts. Without grease the moving parts would heat up due to the friction.
A simple machine doesn't have any moving parts.
They are called simple machines.
They don't have moving parts.
Oil and grease is used to eliminate friction between moving parts.
To decrease friction in machines, you can use lubricants like oil or grease on moving parts. You can also make sure that the surfaces in contact are smooth and well-maintained. Additionally, reducing the pressure or load on the parts can help decrease friction.
yes it does
to reduce friction
The engine oil helps in lubricating the machine. Oil helps in cooling the engine and lubricates the moving parts properly. The moving parts are constantly shifting and are connected to each other. Oil is needed to grease the parts so that the components move properly without causing harm to the machines.
A grease gun is used to force grease through a grease nipple, and so protect moving parts in a vehicle (for instance) from excessive wear.