Mechanical Engineering - Engineering Mechanics - Discussion

When the angle of inclination is equal to the angle of friction, the component of weight parallel to the plane is just sufficient to overcome the frictional force.

So, Option A is correct.

It should be equal.

@all.

A body on an inclined plane just tends to slide down if the angle of inclination is equal to the angle of friction because when angle of inclination is equal to angle of friction, the component of weight parallel to the plane is just sufficient to overcome the frictional force.

A body on an inclined plane just tends to slide down if the angle of inclination is equal to the angle of friction because when angle of inclination is equal to angle of friction, the component of weight parallel to the plane is just sufficient to overcome the frictional force.

If asked about that the body is on the verge of motion then it will be equal to but here it is saying that the body is moving so the angle of the plane should be greater than the angle of friction.

It should be equal to.

It is very simple.
If a body is kept on a horizontal plane (angle of the plane {x} =0)

Here the friction force will be maximum so the angle of friction {y} will also be maximum.
Now if we increase the angle "x" the plane becomes inclined.
Now the friction force starts to decrease because it starts to act opposite in the direction of the line of motion to prevent the motion so, the magnitude of friction gets decrease and the angle of friction will also get decrease.

That means;
Y > X = REST.
Y = X = IMPENDING MOTION.
Y < X = MOTION.

Thanks @Makvana.

Thanks @Makvana.

Simple & effective explanation.

Begins to move down when angle of inclination equals angle of friction.