B. Fill in the blanks.
1. Muscular force is a _______force.
2. Newton is the S.l. unit of______
3. Every object in this universe attracts every other object with a force of_________
4. Static friction is _______ than sliding friction and _______friction is the least.
5. Aeroplanes and speed boats are streamlined to _________friction.
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Explanation:1) MUSCULAR FORCE IS AN EXAMPLE OF CONTACT FORCE
2) The SI unit of force is the newton
3) Every object in the universe attracts every other object. This force is called Gravitation
4) During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction. But, when the object is at rest, the surfaces interlock well, therefore friction is more. This explains why sliding friction is less than static friction
5)Boats and aeroplanes are streamlined so as to reduce fluid friction.
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