8.1.B—Describe the electric and gravitational forces that result from interactions between charged objects with mass

Describe the electric and gravitational forces that result from interactions between charged objects with mass.

• Electrostatic forces can be attractive or repulsive, while gravitational forces are always attractive.
• For any two objects that have mass and electric charge, the magnitude of the gravitational force is usually much smaller than the magnitude of the electrostatic force.
• Gravitational forces dominate at larger scales even though they are weaker than electrostatic forces, because systems at large scales tend to be electrically neutral.