Question

friction can be reduced by ​

Answer 1

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Methods for decreasing friction:

• Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
• Lubrication is another way to make a surface smoother. ...
• Make the object more streamlined. ...
• Reduce the forces acting on the surfaces. ...
• Reduce the contact between the surfaces.

Answer 2

Answer:

greasing

ball bearing

rubbing oil