^Work by a variable force
^Work by a variable force lso work = Area under F – S graph bounded with the displacement – axis.
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^Work by a constant force
^Work by a constant force Work done by a constant force on a system is defined the dot product of the force acting on the system & the displacement of the system.
^Work
^Work A force is said to be doing work on a system if it displaces the system from its initial position on which it acts. Work is not defined at a position or at an instant. It is defined for some displacement only. Work can be +ve, – ve or zero.
^Death well & Rotor
^Death well & Rotor Static friction balances the weight of person & normal reaction (due to centrifugal force) provides the necessary centripetal force i.e. f = mg Using f = μs N, condition for
^Insect crawling in a hemisphere
^Insect crawling in a hemisphere Consider an insect crawling up a rough hemisphere. As the insect crawl up the force pulling it down the hemisphere i.e. mgsinθ increases where as normal reaction N = mgcosθ & thus limiting friction on it decreases. Let at a height h, mgsinθ is just balanced by limiting friction. After […]
^What is cold welding
^What is cold welding If two blocks of highly polished steel were cleaned and placed together in a perfect vacuum, they would weld themselves together and become one block of steel. This is called cold welding. In reality, small amounts of air, moisture, and contaminants accumulate on surfaces and prevent such “ideal” interactions.
^Friction enables us to walk
^Friction enables us to walk In order to run or walk forward we push (P) the ground backward at some angle to vertical. The reaction of this push can be resolved in components. The vertical component balances our weight, where as the horizontal component push enables us to walk forward. For no slip, FL ≥ […]
^Motion on a rough inclined plane
^Motion on a rough inclined plane Consider a body placed on a rough inclined plane. The y component of the gravitational pull mg cosθ presses the plane & is balanced by normal reaction from the plane, thus N = mg cosθ. The x component of the gravitational pull mg sinθ (say, F) tends to move […]
^Chain on a rough horizontal table
^Chain on a rough horizontal table Fraction of chain length that can hang without slipping on a rough table is
^Retardation by friction on a rough horizontal surface
^Retardation by friction on a rough horizontal surface An automobile is moving on a horizontal road with a speed u. If the coefficient of fiction between the tyres & the road is m. The shortest distance in which the automobile can be stopped is
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