Question

state true or false:-
1.. Sliding friction is about 100 to 1000 times more than rolling friction..
2... In many machines or machine parts, lubricants like grease or powder are used...
3... Wear and tear as a result of friction decreases the working efficiency of the machine parts..
4.... Applied forces and friction are both non-contact forces.
5... Fine powder is sprinkled on the carom board to increase the friction..
6... Tyres of vehicles are lubricated to increase friction between their surface contact with the road surface..

Answer 1

all are true except 6 point ,2 point and 5 point