give 10 examples where friction is not useful?
Answers
ANSWER
1.) When you fall down and slide along a downward sloping asphalt road, face down, friction is harmful.
2.) Writing with your Parker fountain pen on a poorly finished wall.
3.) During space craft re-entry, atmospheric friction is an evil to the spacecraft and heat shields are a must.
4.) When you try to unravel the knots in the wires of your ear phone, friction is such an annoying thing.
5.) When you drag your nails on a blackboard, the sound caused by the friction can be jarring to the ears
6.) When you make Dosa/Pancakes depending where you are from, if the pan is not a non-stick one and if you forget to pour oil beforehand, good luck fighting with it and removing the burnt parts on the pan later.
7.) It’s evil when you try to learn the moonwalk of Michael Jackson. Put some powder on the floor and then do it.
8.) When your car is keyed by someone.
9.) When you are learning to play your guitar and the sliding hand is very sore because of friction.
10.) In the rail gun developed by the Americans where the high speed projectiles really wear down the track (rails) due to friction, requiring maintenance or a better solution: perhaps aided with a passive magnetic levitation system.