Performance Expectations: 5-PS2-1: Support an argument that the gravitational force exerted by Earth on objects is directed down.

Disciplinary Core Idea: PS2.B The gravitational force of Earth acting on an object near Earth's surface pulls that object toward the planet's center. (5-PS2-1)

Cross cutting concepts: Cause and Effect ▪ Cause and effect relationships are routinely identified and used to explain change.