Introduction to gravity's effect on weight. This short lab allows students to make their own connections between weight and mass, as well as, the mass of an object is proportional to its gravitational pull. MS-ESS2-4 Develop a model to describe the cycling of water through Earth's systems driven by energy from the sun and the force of gravity.MS-PS2-4. Construct and present arguments using evidence to support the claim that gravitational interactions are attractive and depend on the masses of in