Hello, If forces between two objects are equal and opposite, then how can a van pull a car if they were attached with, say, some rope (e.g)? Surely the force of the car on the rope is equal and opposite to the force of the rope on the car. So is it because the van and car are of different masses or something to do with friction? I'm not entirely sure, so any help would be much appreciated. Please base advice to secondary school (year 11) /high school student (10th grade). Thanks.