Question

Fill in the blanks : i)______ and_______are used to reduce friction.
ii)Friction always_______the motion.
iii)Friction is less between very______ surfaces.
iv)Friction is_____as well as_______.​

Answer 1

Answer:

1 lubricants and polishing

Answer 2

Explanation:

Lubricants substance and polishing

oppose

plane surface

useful also and harmful