Why Orbits Happen Practice Test

A simplified model shows a planet orbiting a star. At one point on the orbit, the planet has a forward-motion arrow tangent to the curved path and a gravity-pull arrow pointing toward the star. The model states: “Orbit results from gravity plus motion, not a single cause.”

Which statement is supported by the model? (Choose ONE.)

A simplified model shows a moon orbiting a planet with (1) a gravity pull arrow pointing toward the planet, (2) a forward motion arrow tangent to the path, and (3) a curved orbit path. The model states: “Orbit results from gravity plus motion, not a single cause.”

Which set of statements is supported by the model? (Choose ONE set.)