The collision force determines how much resistance the gate will encounter before stopping or reversing. If the setting is too low, the gate might exert excessive force before stopping, which can be dangerous to people, pets, or objects in its path. By adjusting the collision force, you can make the gate more sensitive to obstacles. This is especially important in environments where children or pets are present, as a high force setting will ensure that the gate stops or reverses upon encountering even slight obstructions.