Final answer:
Two different forces of friction affect the system's overall acceleration and the tension in the string. A system may not move due to static friction balancing the applied force, resulting in no acceleration. For example, a stationary mass suspended by a rope has equal tension and weight forces, resulting in no net force and no movement.
Step-by-step explanation:
Yes, two different forces of friction impact the overall acceleration of the system, as friction is a force that opposes motion and affects net force and thus acceleration.
The tension inside the string can change if the forces acting on the system are unbalanced, which would cause acceleration altering the tension. Some systems may not move if the static frictional force equals the force attempting to cause movement, resulting in no net force and therefore no acceleration. An example is a stationary mass where the tension in the rope equals its weight and since there is no net force (Fnet = T - w = 0), the acceleration is zero.
To visualize this, consider a stationary 5.00-kg mass which has a gravitational force (w) acting downward and tension (T) in the rope acting upward. According to Newtons second law, these forces must be equal for the mass to remain at rest (w = T). If the mass is 5.00 kg, the weight w would be w = mg = 5.00 kg * 9.8 m/s^2 = 49 N. Thus, the tension in the rope must also be 49 N to maintain equilibrium and prevent motion.