Final answer:
The primary forces that influence movement as you walk across a room are gravity, which keeps you on the ground, and friction between your feet and the floor, which allows you to push off and move.
Step-by-step explanation:
As you walk from one end of the room to the other, the forces influencing your movement are primarily gravity and friction. Gravity is an external force that keeps you anchored to the ground, and friction is another external force that occurs between your feet and the floor, allowing you to push off and move forward without slipping.
Tension is not typically a force that would influence walking across a room, unless you are holding on to something that is providing additional force or support.