Question

dean created this model to show that planets in the solar system move along a set path or orbit. which statement best explains dean’s model? the suns gravitational pull on mars keeps mars in orbit. mars moves in an orbit around the sun, and this creates gravity. mars has a constant velocity, so this keeps mars in orbit. the sun pushes mars away from its surface and into orbit.

Explanation:

To determine the best explanation for Dean's model (planets moving in orbits), we analyze each option:

• Option 1: The sun's gravitational pull on Mars keeps Mars in orbit. This is correct because gravitational force from the sun provides the centripetal force needed for Mars to follow its orbital path.
• Option 2: Mars' orbit does not create gravity; gravity (from the sun) causes the orbit. So this is incorrect.
• Option 3: Mars does not have constant velocity in orbit (speed may be constant, but velocity (a vector) changes direction, so it's accelerating). Also, constant velocity alone wouldn't keep it in orbit—gravity is needed. Incorrect.
• Option 4: The sun does not push Mars; it pulls via gravity. Incorrect.

Answer:

A. The sun's gravitational pull on Mars keeps Mars in orbit.