Engineers at the University of Minnesota have developed a new system that can move objects without making physical contact. The technique involves ultrasound waves acting on specialized surfaces to ...

Magnets produce an invisible force that can push or pull objects without even touching them. This video explains how magnetic fields are formed, how poles work, and why magnets attract or repel. Learn ...

All of the objects in our solar system are acted upon by forces. Forces are pushes or pulls. Every force has both a strength and a direction. Applying a force on something–like pushing a toy car–can ...