3. Which of the following is used to increase friction?
(a) Spike in shoes
(b) Grooves in tyres
(c) Saw dust on polished floor
(d) Grease on machine parts
Answers
Answered by
2
Answer:
Making grooves in the shoes increases friction. Polishing rough surfaces makes it smooth, thus reducing friction.
Answered by
1
Explanation:
Making grooves in the shoes increases friction.
Polishing rough surfaces makes it smooth, thus reducing friction.
Wheels and ball bearings create rolling friction which has the least magnitude compared to sliding and static friction.
Air cushion makes a layer of air between two surfaces, which helps in reducing friction.
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