(3) In an experiment with a block of wood on an inclined plane, with dimensions
ID: 1335034 • Letter: #
Question
(3) In an experiment with a block of wood on an inclined plane, with dimensions shown in the figure, the following observations are made: (1) If the block is placed on the inclined plane, it remains there at rest. (2) If the block is given a small push, it accelerates towards the bottom without any further pushing.
Which is the best conclusion that can be drawn from these observations? (a) The coefficient of kinetic friction must be negative. (b) Both coefficients of friction must be less than 0.25. (c) Both coefficients of friction must be greater than 0.25. (d) The coefficient of static friction must be less than the coefficient of kinetic friction. (e) The coefficient of static friction is greater than 0.25 while the coefficient of kinetic friction is less than 0.25. Explain, briefly, why.
Explanation / Answer
Figure is missing in the given queston.
Correct option is (e)
Coefficient of kinetic firction is always less than coefficient of static friction.
Cofficient of static firiction = tan (theta)
If Cofficient of static firiction is less than tan (theta) =0.25 value it will be slided on inclined plane.
So the Cofficient of static firiction should be greater than tan (theta) =0.25 to remains rest on incline plane.
If Cofficient of kinetic firiction should be less than tan (theta) =0.25 then only the block accelerated towards bottom.
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