"In the next instant, Caedus found himself flying across the cabin towards his observation bubble. Luke had not even gestured, had not flinched, had not even shifted his gaze; he had just simply grabbed Caedus through the force and hurled him five meters into his chair.
While it was true Luke had taken him by suprise, it was equally true that he had done so with no visible effort- and that he was continuing to hold him with no apparent exertion."
Also:
Krova acknowledged the order, and a moment later Caedus felt the Jedi moving away from the Anakin Solo. Realizing it would soon be time for him to coordinate their attack with Admiral Bwua'tu, Caedus grabbed his meditation chair in the Force and discovered that he could not turn it back toward the battle. No matter how hard he exerted himself, it would not budge.