Gravity

Speed necessary for the space station to stay in orbit.

What is the acceleration due to gravity at the space station.

Why do astronauts appear weightless despite being near the Earth?

What would fall faster on the moon, a brick or a feather?

Viewing g as the value of Earth's gravitational field near the surface rather than the acceleration due to gravity near Earth's surface for an object in freefall.

Basics of gravity and the Law of Universal Gravitation.