A) Ball bearing
B) Lubricant
C) Rolling
D) Grooving and treading
Correct Answer: D
Solution :
Grooved and treaded is increasing the friction. The sole of your shoe is grooved, it is done to provide the shoes better grip on the floor, so that you can move safety. Similarly the treaded tyres of cars, trucks and bulldozers provided better grip. The correct answer is D.
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