Question

Collect information about the substances using to reduce the friction in different machines and prepare a report

Answer 1

lubricants like oil, greece, or by smoothing surface, or reducing surface area

Answer 2

to reduce te friction ball bearings are used to reduce friction.ball bearing Chang's sliding friction to rolling friction .this is very useful as rolling friction is much smaller than sliding friction . ball bearings are used in most mechanical structurs which have moving parts . small metal balls made of stainless steel ,brass,ceramic,etc...,are placed between moving surface to reduce friction