Q. give reason for the following .
1. two bodies of birds are streamlined .
2. a lubricant reduces friction .
3. grooves are made in tyres .
Answers
Answer:
1. Ans :The bodies of birds are Streamline to reduce the air resistance during flying. In easy words, to let them fly properly. Explanation: ... The streamlining is achieved by specially arranged feathers that reduce the friction that would otherwise act as a drag against the forward-moving body
2.Ans:Lubrication reduces the heat generated when two surfaces are in motion. It smoothes the process by forming a film between two surfaces that reduces friction and thus improves performance and efficiency.
3.Ans :The grooves in the rubber are designed to allow water to be expelled from beneath the tire and prevent hydroplaning. The proportion of rubber to air space on the road surface directly affects its traction. Design of tire tread has an effect upon noise generated, especially at freeway speeds.
I HOPE IT HELPS YOU UNNIE!
AND SO SORRY FOR SPAMMING...
Answer:
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