The force exerted by a magnet on an object largely depends on which factors?

The force exerted by a magnet on an object is primarily influenced by the amount of ferrous material in the object and the distance between the magnet and the object. Ferrous materials, which contain iron or similar metals, are strongly attracted to magnets. The greater the amount of ferrous material present, the stronger the magnetic force because the material can align more effectively with the magnetic field.

Additionally, the distance to the magnet plays a critical role; as the distance increases, the magnetic force weakens significantly. This is due to the nature of magnetic fields, which diminish rapidly with distance. Consequently, both the presence of ferrous material and the proximity to the magnet are fundamental in determining the extent of the magnetic force exerted on an object.

Other options do not accurately capture the primary factors influencing magnetic force. Weight and shape do not directly relate to the magnetic properties of an object. Size and speed might affect the dynamics of movement but not the force exerted by a static magnetic field. Temperature and pressure can influence material properties but do not directly affect the strength of the magnetic attraction in the context of the question.