Planetary Motion and Gravitation Quiz

Who first proposed that the Sun, not Earth, was the center of our solar system?

• Tycho Brahe
• Johannes Kepler
• Nicholas Copernicus
• Isaac Newton

According to Kepler's First Law, planetary orbits are:

• Perfect circles
• Elliptical
• Straight lines
• Random paths

In Kepler's Second Law, planets move faster when:

• Farther from the Sun
• Directly overhead
• Closer to the Sun
• At constant speed

The universal gravitational force depends on which two primary factors?

• Planet size and color
• Mass of objects and distance
• Temperature and pressure
• Velocity and acceleration

What mathematical symbol represents the Universal Gravitational Constant?

• F
• G
• M
• R

Kepler's Third Law relates a planet's:

• Speed and color
• Orbital period and distance
• Temperature and mass
• Rotation and size

The gravitational force follows what type of law regarding distance?

• Linear increase
• Constant rate
• Inverse square law
• Exponential growth

Which astronomer was known for precise observations without telescopes?

• Nicholas Copernicus
• Johannes Kepler
• Tycho Brahe
• Isaac Newton

In the gravitational force equation F = G × (m1 × m2) / r², what does 'r' represent?

• Radius
• Revolution
• Distance between object centers
• Rotation speed

What keeps planets in their orbital paths around the Sun?

• Magnetic fields
• Wind currents
• Gravitational force
• Electrical charges