Friction Basics http://www.physics4kids.com/files/motion_friction.html Moti http://www.physics4kids.com/files/motion_friction.html http://www.physics4kids.com/files/motion_friction.html http://www.physics4kids.com/files/motion_friction.html Moti Moti http://www.physics4kids.com/files/motion_friction.html http://www.physics4kids.com/files/motion_friction.html Moti Physics4kids.com Friction basics http://www.physics4kids.com/files/motion_friction.html friction is a force between two objects that opposes motion http://www.physics4kids.com/files/motion_friction.html Friction http://www.physics4kids.com/files/motion_friction.html http://www.physics4kids.com/files/motion_friction.html Friction Basics http://www.physics4kids.com/files/motion_friction.html Friction Friction Moti http://www.physics4kids.com/files/motion_friction.html Moti Moti