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Grade 11Mechanics

Please solve this question
Answer is Option A : mg
Why is it mg?

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Profile image of Myra
6 Years agoGrade 11
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1 Answer

Profile image of Arun
ApprovedApproved Tutor Answer6 Years ago
If the reaction is N then

Frictional force=u N (u is coefficient of friction).

Since block is placed on the inclined plane, so

N=mg Cos (theta)

m is the mass of the body placed on the plane.

Here N and uN both the forces are applied on the block by the inclined plane and both are acting at right angle between them, therefore total force applied on the block by the inclined plane is

F (net)=[(uN)^2+N^2]^(1/2)