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gopal nair Grade: 12
        

Sir,


Here is my question.


A block is kept on a smooth inclined plane of angle of projection theta that moves with a constant accelartion so that the block does not slide relative to the inclined plane.If the inclined plane stops,the normal contact force offered by the plane on the block changes by a factor of what?

8 years ago

Answers : (1)

Tushar Watts
19 Points
										

First calculate the acc which will stop the motion. Taking @ = theta


For =lbm, , macos@ = mg sin@


Therefore, a = g tan@


Also, N= ma sin@ + mg cos@


On substitution,


N = ma (cos 2 @ + sin 2@ ) / cos@


Since cos 2 @ + sin 2 @ = 1,


N = ma / cos@


When motion is stopped,


N = ma cos@


Therefore, change = ma cos@ / (ma / cos@ ) = cos 2 @

8 years ago
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