For the system form of the basic laws, the momentum of a system can change as a result of: a. pressure acting on the system. b. friction acting on the system. c. gravity acting on the system. d. body forces acting on the system. e. surface forces acting on the system. f. all of the above.

Option f

All of the above

Explanation:

Considering a control volume, the system form shows that the change in momentum is affected by any force at all on the system, this includes, pressure force, frictional force, gravity force, or any other body or surface forces on the system.

For steady flow with a fixed control volume, the most useful form of the momentum equation is given as:

This shows that all forces, whether body forces or contact forces present in the system can affect the momentum of the system.