Tag: increasing and reducing friction

Questions Related to increasing and reducing friction

Which of the following is used to reduce friction :
1. Streamlines
2. Use of ball bearings
3. Lubrication

physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

  1. 1 & 2 only

  2. 1 & 3 only

  3. 2 & 3 only

  4. 1, 2 & 3

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Correct Option: D
Explanation:

All the mentioned option are correct.

Streamlines reduces the friction in fluid.
Use of ball bearing reduces the friction in machines rotating parts.
Lubricants are used in machines  and moving parts to reduce friction.

Option D is correct.

Why are efforts made to reduce friction?

physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

  1. Energy is lost in overcoming friction.

  2. Overcoming friction is a time consuming process.

  3. Both A and B

  4. None of the above

Show answer
Correct Option: A
Explanation:

A lot of the applied energy is lost in overcoming friction so as to put a body in motion.Hence efforts are made to reduce friction.