Understanding Non-Contact Forces: Gravity, Electricity, and Magnetism

The video discusses non-contact forces, which act at a distance without physical contact. It covers gravitational, electric, and magnetic forces, explaining their characteristics and dependencies on factors like mass, charge, and proximity. Gravitational force is always attractive, while electric and magnetic forces can be either attractive or repulsive. The video emphasizes the importance of fields in exerting these forces and encourages further exploration of related topics.

What distinguishes non-contact forces from contact forces?

• Non-contact forces only occur in outer space.

• Non-contact forces are weaker than contact forces.

• Non-contact forces act at a distance without direct contact.

• Non-contact forces require physical contact between objects.

Which of the following statements about gravitational force is true?

• Gravitational force is an action-reaction pair.

• Gravitational force increases with distance.

• Gravitational force is independent of mass.

• Gravitational force is repulsive between two masses.

How does the gravitational force between two objects change if one object's mass decreases?

• The gravitational force remains the same.

• The gravitational force increases.

• The gravitational force becomes repulsive.

• The gravitational force decreases.

What happens to the electric force between two charged objects as they move closer together?

• The electric force decreases.

• The electric force remains constant.

• The electric force increases.

• The electric force becomes zero.

Which statement is true about magnetic forces?

• Magnetic forces only attract objects.

• Magnetic forces can be both attractive and repulsive.

• Magnetic forces are unaffected by distance.

• Magnetic forces only occur in electric fields.