Why should the portion of thrade between the moving body and Pulley be horizontal?
Comment on the statement the friction between the two surfaces can never be zero?
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Why should the portion of thrade between the moving body and Pulley be horizontal?
The portion of string between the pulley and wooden block must be horizontal otherwise only a component of tension in the string would act as the force to move the block.
Comment on the statement the friction between the two surfaces can never be zero?
No we cannot reduce friction to zero because friction exists at even atomic levels too. Friction cannot be reduced to perfect 0, if two surfaces are touching each other with some pressure. ... Without applying normal pressure, we cannot do any useful work in the world.
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Answer 1
The portion of the thrade between the moving pulley and body should be horizontal so if it would not be as that then only a component of tension in the thrade would act as the force to move the block .
Answer 2
Yes ,the friction between the two surface cannot be zero it is because the surface contain many groobs so even if we use a lot of lubricants then the friction will be reduced but can never be reduced to zero because every surface will still have some minor irregularities of them.
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