As the block slides with constant velocity down the plane the Normal ReactionOriginally Posted byRefujoi

, the Frictional force , and the Gravitational force on the block are in equilibrium.

Resolve the gravitational force into components down the plane and normal to

the plane and set these equal to the frictional force and the normal reaction

(allowing for the appropriate signs):

,

where is the inclination of the plane.

Now , where is the coefficient of

kinetic/sliding ... friction. So:

rearranging:

.

In this problem , so:

.

RonL