mass and gravity
The two factors related to gravitational pull are (total) mass and distance.
The gravitational pull is always present: there is no "when".
Any two objects with mass will have a gravitational force. The orbit of planets around stars depends on the gravitational pull of the star. The Earth exerts a gravitational pull on its moon but the moon also exerts a pull on the Earth.
All masses have a gravitational pull which increases with the size of the mass - if you took a marble though, it would have a gravitational pull but it is too weak to be noticeable. Two mases attract eac other because of their gravitational pull.
inertia and gravitational pull
Mass & distance.
Gravitational Pull.
No. "Pull" is a force, not an acceleration.
Yes. Gravitational pull is based on mass. And since the bowling balls have greater mass than the ping pong balls then the gravitational pull would be greater.
The mutual gravitational forces between the Moon and the Earth are strongest when the distance between the two bodies is smallest. Just like the mutual gravitational forces between any other two bodies.
All materials with mass exert a gravitational pull.
All obects have a gravitational pull. The larger it is, the stronger the pull.