Hi my background is in mechanical engineering. I use a little bit of motion physics but not often. Pls excuse any errors or wrong terminology I may use. Einstein's theory of relativity addresses the force of gravity in space time but does it address or apply to gravity on Earth? What creates or causes the gravity on earth? Gravity which is responsible for holding everything to the surface of the earth. From objects at rest or in motion to liquids and solids. I believe Newton states that mass creates gravity. The greater the mass the greater the gravity. Isaacs equations are still widely used today in engineering. I have often referred to them myself. So if I put a bowling ball in a vacuum of space will a small ball bearing be drawn to it due to a gravitational force?