Because the block is not moving, the sum of the x components of the forces acting on the block must be zero. find an expression for the sum of the x components of the forces acting on the block, using coordinate system b. express your answer in terms of some or all of the variables fn, ff, fw, and θ.

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.