Question

Q. 1- friction is a necessary evil ? explain.
Q.2- what is lightning conductor ?
Q.3- what causes lightning ?
Q.4- What is electroplating ? how it can be done ?
answer urgent​

Answer 1

1. Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. ... Hence it is considered as a necessary evil .
2. A metal rod or wire fixed to an exposed part of a building or other tall structure to divert lightning harmlessly into the ground.
3. Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves.
4. Electroplating involves passing an electric current through a solution called an electrolyte. This is done by dipping two terminals called electrodes into the electrolyte and connecting them into a circuit with a battery or other power supply.