The Earth and Gravitation

1. What is the attractive force that exists between any two particles in the universe called?

• A) Gravity
• B) Gravitational force
• C) Acceleration
• D) Weight

2. What is the attractive force called when one of the two interacting objects is the Earth?

• A) Gravitation
• B) Universal force
• C) Gravity
• D) Inertia

3. Why does an astronaut's mass remain unchanged whether they are on Earth or on the Moon?

• A) Because their weight is constant everywhere
• B) Because the gravitational pull is the same everywhere
• C) Because mass is the amount of material in an object and does not change with location
• D) Because the acceleration due to gravity is the same everywhere

4. At which location on Earth is an object's weight the highest?

• A) At the equator
• B) At the poles
• C) At the center of the Earth
• D) At the equinoctial point

5. By which symbol is the acceleration due to gravity indicated?

• A) G
• B) F
• C) m
• D) g

6. According to Newton's law of gravitation, if the distance between two objects is tripled, what happens to the gravitational force between them?

• A) It becomes three times larger
• B) It becomes one third of the original force
• C) It becomes nine times larger
• D) It becomes one ninth of the original force

7. What is the international unit of mass?

• A) newton
• B) kg
• C) meter/second²
• D) ton