Gujarat BoardEnglish MediumSTD 8ScienceFriction1 Mark
MCQ
Which of the following doesnt reduce friction?
A
Ball bearing.
B
Lubricant.
C
Rolling.
✓
Grooving and treading.
✓
Answer
Correct option: D.
Grooving and treading.
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.
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