Question

1-Name the kind of frictional friction, that comes into play, when a book, kept on collection of cylindrical pencils, is moved by pushing it.
2-Why are objects given special shapes when they are moving through fluids?
Write the name given to these special shapes.​

Answer 1

Answer:

Ans1. Rolling Friction

Answer 2

Ans1
Rolling resistance is the friction, that comes into play, when a book, kept on a collection of cylindrical pencils, is moved by pushing it. Rolling resistance, also called rolling friction or, is the force resisting the motion when a body rolls on a surface.

Ans2

Objects moving in fluids face the friction of the fluid that opposes their motion. So Objects moving in fluids must have unique shapes called streamlined shapes to reduce the fluid friction.

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