Question

which is the following is not true first friction wears down machine parts second friction helps us walk third friction helps a ship move through water fourth friction produce heat​

Answer 1

Answer:

Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids.

Explanation:

For instance, when two objects rub together, friction causes some of the energy of motion to be converted into heat. This is why rubbing two sticks together will eventually produce a fire. ... That's why lubricants, or liquids, are often used to reduce the friction — and wear and tear — between moving parts.