GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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work
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power
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Either A or B
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None of the above
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Detailed explanation-1: -To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle to the displacement, the work done is W = fd cos .
Detailed explanation-2: -Work is not defined simply as force times distance except in the very simplest examples of introductory physics. Work is the amount of energy imparted or removed from the motion of a given object under the influence of any and all relevant forces. We don’t, at least not in a general sense.
Detailed explanation-3: -Work is the force exerted on an object times the distance over which the force is exerted: W = Fx, where W is the work in Nm = Joule. Work done to lift an object of mass m a height h: W = Fgh = mgh. Work done against friction: W = Ff x.