the world > matter > physics > energy or power of doing work > [noun] > capacity for exertion of mechanical force > motive power or force (6)
gen. Any agent or force acting on a body to produce motion.
A motive force in a machine. In later use chiefly figurative.
The power to initiate movement, esp. the muscular or mechanical power needed to move the body or a machine; (hence) the force acting on a body to…