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sunil kumar pal Grade: 12
        WHAT Is workdone in displacing a block on a smooth surface under the action of a constant force and hence under a cons acceln
7 years ago

Answers : (2)

bibhash jha
15 Points
										

 







Let us take a ball that can slide along a frictionless wire, stretched along the horizontal X-axis. A constant force directed at an angle.


f to the wire, accelerates the bead along the wire. According to Newton's second law


Fx = max ______(1)


As the ball moves through a displacement 'd', the force changes the ball's velocity from an initial value to another value. As is constant,  acceleration 'a' is also constant.


According to equation of motion


v2 = v02 + 2 axd ______(2)


Substituting (1) in (2), we get




Hence, the work done by the force on the ball is equal to the energy transfer. Work done due to the force is W = Fx d.


Therefore, to calculate work, we have to use only the force component along the object's displacement.



W = Fx d.



=


This is the work done by a constant force (i.e., the magnitude and the direction of the force do not change.).


Work is the energy transferred to or from an object by means of a force acting on the object. Energy transferred to the object is positive work and energy transferred from the object is negative work.


 

7 years ago
Askiitian.Expert Rajat
24 Points
										

Since the surface is smooth and it is assumed to be horizontal, there fore there wont be any work done.


 


For more details , please post your question in a little more details


 


regards,


Rajat

7 years ago
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