Know that: (a) the Earth is a planet that orbits the Sun once in approximately 365 days (b) the orbit of the Earth around the Sun is an ellipse which is approximately circular (c) the Earth rotates on its axis, which is tilted, once in approximately 24 hours (d) it takes approximately one month for the Moon to orbit the Earth (e) it takes approximately 500s for light from the Sun to reach the Earth

Describe, qualitatively, motion in a circular path due to a force perpendicular to the motion as: (a) speed increases if force increases, with mass and radius constant (b) radius decreases if force increases, with mass and speed constant (c) an increased mass requires an increased force to keep speed and radius constant (F = mv²/r is not required)