MoCA Science Practice Test

The principle that explains why Lee's trick could work with attraction is magnetism. This phenomenon occurs when certain materials exert a force attracting or repelling other materials without direct contact, under the influence of magnetic fields. In the context of a trick involving attraction, magnetism could be responsible for objects appearing to move towards each other or be drawn together, creating an illusion of attraction. This principle is commonly used in magic acts, where magnets can manipulate the movement of metallic objects, making them appear to be responding to unseen forces.

While psychological effectiveness could describe the impact of perception on the audience's understanding of the trick, it doesn’t physically explain the mechanisms at play. Optical illusions relate to visual misperception but do not involve any physical forces like magnetism. Electromagnetic dynamics is a broader term that includes magnetism but is not specific enough to accurately describe the phenomenon in this context. Thus, magnetism is the most precise and applicable explanation for the trick involving attraction.