whyit is easier to push an empty box than the box full of books
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a) It's more difficult to push a box full of books than an empty box because the mass of box full of books is larger and results in larger frictional force (μ mg )
b) it's difficult for a fireman to hold a hose which ejects large amount of water with high velocity because the change of momentum of fluid exiting exerts a backward force on the hose pipe which is held by the fireman
b) it's difficult for a fireman to hold a hose which ejects large amount of water with high velocity because the change of momentum of fluid exiting exerts a backward force on the hose pipe which is held by the fireman
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