Question

Which best explains parallel forces?

left and right forces that can be added together
right and upward forces that cancel each other out
addition of parallel forces that cannot result in a negative force
left and downward forces that cancel each other out

Answer 1

"left and right forces that can be added together"

Parallel forces act along parallel lines (e.g., left/right along the same axis) and can be added algebraically, with direction treated by sign (e.g., 5 N right + 3 N left = 2 N right).