Question

write about the substances using to reduce the friction in different machines . plz answer this question?​

Answer 1

1. Grease - for moving parts
2. Powder - for moving parts
3. Ball bearing - In fans and motors
4. Oil - For all parts probably moving

Answer 2

Answer:

Lubricants are also used to reduce friction in grinding machines, in leigth machines

greese is also a lubricant

oils are also used.

and the main thing is that the bearings are used in the machines or in the wheels such that the firction is minimum and bearings increase the efficiency of rolling motion