Two identical ice pucks A and B collide on nearly frictionless horizontal ice
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
Two identical ice pucks A and B collide on nearly frictionless horizontal ice. The system is defined as consisting of both pucks only. Which of the following forces acting during the collision is external to this system?
(a) The force of puck A on puck B
(b) The gravitational force exerted by Earth on puck A
(c) The gravitational force between the two pucks
(d) None; there are no external forces acting during the collision