If you take your hand down in a quick karate chop fashion and strike the ruler, it breaks off the end because the newspaper has lots of surface tension or pressure against the air which inhibits its movement. Earlier I used the word tension and voltage in the same sentence. They all mean the same thing. Radio waves by themselves couldn't cause any movement to occur because there is not enough pressure present in and of themselves. Think of a hose with no fitting on the end and a beachball.
Water comes out and squirts onto the ball.
It's not very much pressure to move the ball. But stop up the end of the hose a bit with your thumb and, yes you've slowed down the amount of flow, but you've also increased the pressure. Now the beachball easily moves with the increased pressure. Since, in this high tension field, the number of cubic inches to 'push off' is enormous, and I would estimate up near a decatillion cubic inches, a fraction of a pound pressure per cubic inch is far more than enough to generate an opposing resistance to push against . This huge field then, or grid, has a great amount of pressure distributed over a large area just like the newspaper analogy - and it resists movement.