Factual error: Twice in the film it is made clear that the Pym particle works by reducing the space between atoms in order to shrink an object, and by increasing it to enlarge them. This means that the object will weigh the same, whether shrunk or enlarged - it cannot be otherwise. A 90kg man the size of an ant would punch a hole through any surface upon which he stood (and couldn't ride ants), Doctor Pym has been walking about with a 60 tonne tank in his pocket, Darren Cross lifts a full grown sheep between finger and thumb, and the supersized Thomas The Tank Engine would be far too light to crush the police car (in fact it would float harmlessly away as it would probably weigh less than the air it displaced).
Ant-Man (2015)
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Directed by: Peyton Reed
Starring: Michael Douglas, Paul Rudd, Evangeline Lilly, Corey Stoll
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More mistakes in Ant-Man
Hank Pym: Scott, I need you to be the Ant-Man.
Scott Lang: One question... Is it too late to change the name?
More trivia for Ant-Man
Question: At several points in the movie, Scott Lang, while small, jumps into and punches a man, who goes flying backwards. However, in the battle with Cross after falling into the swimming pool, Cross, while small, jumps at him and Scott, while large, is able to effortlessly swat him into the bug zapper. A similar thing happens during Scott's fight with The Falcon. So, in a collision between someone large and someone small, who is supposed to win, and who is supposed to go flying?
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Chosen answer: Despite the explanation given in the movie for being able to reduce objects and people being "reducing the space between atoms", there are clear indications that there's more to it than that as that explanation wouldn't enable changes of mass (i.e. No way an ant could carry the full weight of a man even if he was reduced in size). Therefore there is some way of changing mass at the same time as size and the two aren't necessarily linked (Scott has low mass when riding ants but much higher when he's punching people). Based on this its apparent that when Scott swats Cross into the buzzer he had low mass. So the answer to the question is - it depends on the mass of the smaller person at the time of the collision.