# Equilibrium Net Force of Two Connected Masses on a Plane

Two masses are at rest on a plane inclined at angle s=35Â° above horizontal. A cord from mass A=4 kg, passes over a frictionless pulley at the top of the plane to unknown mass B. The coefficient of friction is f= .25.

See attachment for picture showing blocks and plane.

a. Find the maximum mass of B for the masses to remain in place.

b. Find the minimum mass of B for the masses to remain in place.

https://brainmass.com/physics/equilibrium/equilibrium-net-forc-two-connected-masses-plane-5305

#### Solution Preview

a. Solution for finding maximum mass B:

See solution attachment for picture showing forces.

Gravitational force on B has component 'B g sin s' tending to move mass B down the plane and mass A up the plane. The force opposing downward motion of B is friction force component 'f B g cos ...

#### Solution Summary

The equilibrium net force of two connected masses on a plane are examined. The maximum and minimum mass to remain in place are given.