A 10 lb block with an applied force P = 2 lb is in equilibrium. What is the magnitude of the friction force between the block and the surface? The coefficient of static friction is 0.3 between the block and the surface.

Weight of block = mg

= 10 x 32 = 320 poundal.

frictional force (maximum)

= coefficient of friction x weight of block

=.3 x 320

= 96 poundal.

Applied force = 2 x 32 poundal

= 64 poundal.

Since applied force is less than max frictionl force possible, so

the block must not be moving.

magnitude of frictional force = applied force

= 64 poundal.