Gravitational attraction depends on the mass of an object and the gravitational constant. In this case, the object that experiences the least amount of gravitational attraction toward Earth would be the one with the least mass.
Among the options provided:
- a 40-gram eraser
- a 5-gram pencil
- a 380-gram cup
- a 75-gram calculator
The 5-gram pencil experiences the least amount of gravitational attraction toward Earth.