8. Centripetal Forces & Gravitation

According to Kepler's laws, what is the main difference between Earth's $\mathrm{perihelion}$ and its $\mathrm{aphelion}$?

Which one of the following does Kepler's second law indirectly describe?

According to Kepler's third law, which states that $P^2=a^3$ where $P$ is the orbital period and $a$ is the semi-major axis, how does the mass of a planet affect its orbital period around the Sun?

How did Kepler's discoveries contribute to the field of astronomy?

According to the principles related to Kepler's Laws and tidal forces, when does a spring tide occur?

Which of the following statements correctly describes a planet following an $elliptical$ orbit around the Sun according to Kepler's First Law?

According to Kepler's Laws and the geometry of the $Earth$-$Moon$-$Sun$ system, where must the $Moon$ be in its orbit for the full moon phase to be visible from $Earth$?

Which orbital effect describes how the shape of $\mathrm{Earth}$'s orbit around the $\mathrm{Sun}$ will change over time?

Which of the following phenomena is primarily caused by the tilt of $\mathrm{Earth}$'s axis rather than by $\mathrm{Kepler}’s$ Laws?

Which of the following motions of the $Earth$ is primarily responsible for the occurrence of seasons?

Why is the same side of the $Moon$ always visible from $Earth$?