5. Which of these measures is a way to decrease friction?
(a) Presence of spikes on the soles of football shoes
(b) Application of chalk powder on the hands and feet by gymnasts
(c) Use of rough tyres in racing bikes
(d) Use of narrow boats in rowing
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1
Answer:
Only b and d are ways to decrease friction
Answered by
3
Answer:
(d) Use of narrow boats in rowing
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