Johannes (Kepler) didn't work with gravity at all. He worked with the observations
recorded in his mentor's (Tycho's) notebooks during his lifetime, and figured out the
simplest arrangement of planets that could explain what we actually see them do in
the sky.
His 'model' was: Each planet moves in an elliptical path with the sun at one focus of
the ellipse, and the farther a planet is from the sun, the slower it moves.
Gravity never entered into the picture until Newton ... born 12 years after Kepler died ...
proposed a formula for how gravity works, and showed that if his formula for gravity is
correct, then the planets must move in the way that Kepler suggested.
The objects around you and me are affected by the mass of earth by gravity
yes
gravity
Such an object is said to be in free fall.
An apple
they can be yes.
No. But the weight of that mass depends on the local gravity.
Yes. All objects that have mass are affected by gravity and the gravitational force varies with the masses of the objects.
Yes, there is an object affected by only gravity. Stars and other floating space debris are only affected by gravity in space, as long as the objects do not touch each other.
The one that is heavier
Everything around us is affected by the mass of earth because mass makes a force called gravity and that's what keeps us from floating off Earth and that's how the objects are affected, they are held onto Earth by gravity!
They are all in orbit.