( ( ( The ( friction force ) ) ( acting ( upon the ) ) ) ( ( turned ( ( wheels ( of ( the car ) ) ) ( ( causes ( an ( unbalanced force ) ) ) ( upon ( ( ( the car ) and ) ( a ( subsequent acceleration ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN friction) (NN force)) (VP (VBG acting) (PP (IN upon) (NP (DT the))))) (VP (VBD turned) (SBAR (S (NP (NP (NNS wheels)) (PP (IN of) (NP (DT the) (NN car)))) (VP (VBZ causes) (NP (DT an) (JJ unbalanced) (NN force)) (PP (IN upon) (NP (NP (DT the) (NN car)) (CC and) (NP (DT a) (JJ subsequent) (NN acceleration)))))))) (. .)))
The friction force acting upon the turned wheels of the car causes an unbalanced force upon the car and a subsequent acceleration.
(ROOT (S (NP (DT The) (NN turning) (NN driveshaft)) (VP (VBZ causes) (NP (NP (DT the) (NNS wheels)) (PP (IN of) (NP (DT the) (NN car) (S (VP (TO to) (VP (VB turn)))))))) (. .)))
The turning driveshaft causes the wheels of the car to turn.