( Friction ( ( ( is actually ) ( caused ( by ( ( the ( elemental force ) ) ( of ( electro-magnetism ( between ( two objects ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Friction)) (VP (VBZ is) (ADVP (RB actually)) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (JJ elemental) (NN force)) (PP (IN of) (NP (NP (NN electro-magnetism)) (PP (IN between) (NP (CD two) (NNS objects))))))))) (. .)))
Friction is actually caused by the elemental force of electro-magnetism between two objects.
(ROOT (S (S (VP (VBG Increasing) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (DT the) (CD two) (NNS magnets)))))) (VP (MD will) (VP (VB cause) (NP (DT a) (NN decrease)) (PP (IN in) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (CD two) (NNS magnets))))))))) (. .)))
Increasing the distance between the two magnets will cause a decrease in the force of attraction between two magnets.