The force is greater than zero or unbalanced.
a pulley
unbalanced forces...like gravity, friction, or an applied force
Externally applied forces which are unbalanced (do not add up to zero) = so-called net external force
If the motion doesn't change, then the net force is zero. If there is a forward force, there must be a counteracting backward force. Quite often, this backward force is friction.
Paola Antonelli on Forces That Shaped Humanity Most
How Iraq Changed American Perceptions of War
Photographing the Effects of Climate change
What Climate Change Does for Humanity