MS-PS2-4: Construct and present arguments using evidence to support the claim that gravitational interactions are attractive and depend on the masses of interacting objects.
I can use evidence to explain how gravity acts between objects.
Gravity is always an attractive force.
All objects with mass exert gravitational forces on one another.
More massive objects exert stronger gravitational forces.
Gravity keeps planets, moons, and satellites in orbit.
See also: MS-ESS1-2 Gravity in Space
Gravity is why a basketball comes back down after you shoot it and why you stay on the ground when you jump.
Engineers have to understand gravity when launching spacecraft, satellites, and astronauts.
The Moon's gravity affects Earth's oceans, creating the changing tides you can observe at the beach.
Gravity explains why you would weigh differently on the Moon or another planet even though your amount of matter stays the same.