PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
Two identical low-friction carts, A and B, are connected by a light, inextensible string. A student pulls cart A to the right with a constant horizontal force F. The system for analysis is defined as “carts A and B together, including the string.” Which of the following lists ALL and ONLY the forces that are internal to this system?
(a) the tension force exerted by the string on cart A and the tension force exerted by the string on cart B
(b) the pulling force F and the tension forces in the string
(c) the gravitational forces of Earth on the carts and the normal forces from the track on the carts
(d) the tension force exerted by the string on cart A only