Grade 11Mechanics

A weight W rests on a rough horizontal plane . If the angle of friction is a the least force that will move the body along the plane will be

Wcosa

Wcota

Wtana

Wsina

Ayisha

8 Years agoGrade 11

2 Answers

Arun

Approved Tutor Answer8 Years ago

Dear student

F = $\mu$ mg

but

$\mu$ = tan a

F = mg tan a

F = W tan a

hence option C is correct.

Regards

Arun (askiITians forum expert)

Deekshith

8 Years ago

Angle of friction=angle of repose.

When a body is kept on an inclened plane inclined at an angle equal to angle of repose then it will be ready to move.

i.e., least force that can moce the body along the plane.

So,

F=mg*sina

F=Wsina

So the least force required to move along the plane is Wsina.

So the option is D

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A weight W rests on a rough horizontal plane . If the angle of friction is a the least force that will move the body along the plane will be Wcosa Wcota Wtana Wsina

Ayisha

2 Answers

Arun

Deekshith

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