Final answer:
Increasing the height from which the sled descends will convert more potential energy into kinetic energy, thus increasing its speed, and consequently, the force of the collision with snowmen.
Step-by-step explanation:
The question refers to the effect of the height (speed) on the collision between the snowmen and the sled, and how it changes the force. According to the principles of physics, particularly Newton's second law of motion, the force of a collision is influenced by the mass and acceleration of the colliding object. If we increase the height from which the sled starts sliding down, its potential energy at the start will be converted into kinetic energy as it slides down, leading to a greater speed if there is no significant friction or air resistance. Greater speed means a greater impact force upon collision. Therefore, changing the height of the sled to be greater would lead to increased force exerted upon the collision with the snowmen.