"Friction is a necessary evil". Why ?

Comment upon the following : Transpiration is a necessary evil.

"Transpiration is a necessary evil”, this Statement belongs to

Transpiration is a necessary evill. Justify the statement. Discuss the significance of transpiration.

Transpiration is a necessary evil in plants. Explain

(i) Explain why friction is necessary to make the disc to roll in the direction indicated. (ii) Give the direction of frictional force at B , and the sense of frictional torque, before perfect rolling begins. (iii) What is the force of friction after perfect rolling begins?

(A) : The friction gives the necessary centripetal force at the unbanked curved path ( R) : When a body is moving an un banked curved path below the maximum safe velocity friction has self adjusting nature

(A) : A car can run on road because of force applied by road on the car. (R ) : Friction provides the necessary force for translatory motion for the car.

(A) : A maximum possible speed of a car on banked curved road is greater than that on a flat curved road (R) : On a banked curved road horizontal component of normal reaction by road along with friction provides necessary centripetal force

Is sex education necessary in schools? Why?

Is sex education necessary in schools? Why?