1. What is the effect of mass on gravity?

2. What is gravity? GGravity is the force that holds us down, basically it stops us from floating around… GGravity is all around us, it does not matter where you drop lets say a glue stick gravity will always pull it down, you can drop it from behind you or above you, gravity will always pull us down… GGravity comes from the ground a massive core made of rock and metal has a strong gravitational pull…

3. What does mass mean?  Mass it how heavy it is or how light something is…  For example Earths mass [ how heavy it is] is 80000000 pounds…  So mass means how heavy something is…

4. Does weight affect gravity?  Einstein's theory of relativity adds to this. His theory predicted that objects with great mass deform space around them, causing light to deflect into them. That has been shown to be true. He also predicted that gravity could travel in gravity waves, which we haven't seen yet…  So yes weight affects gravity…  It affects the mass by making two objects or things drop at the same time, weather it be a light or a heavy object…