gravity
The Earth's gravitational force pulls the marble to the bottom of the glass. It is the same force that keeps our feet firmly on the ground.
If a glass marble is placed on a level surface, the only forces are gravity (which prevents the marble from floating off the surface), and the lack of lateral force (it is not pushed by hand), and friction as the surface is level. One could assume, that only in a vacuum jar, would the marble have zero force. But then, surely, the earth gravity must still have some effect?
If "a marble" refers the the glass marble popular with children? Then, yes, if enough pressure is used the glass marble will crumple into a fine powder. If the question refers to the rock known as marble, (which is a hard crystalline metamorphic form of limestone) then it is still possible to compress it. But, as to what effect? Marble is a type of limestone that has all ready been subjected to far more pressure than we could inflict on it.
Glass is an amorphous solid, not a force.
Because the marble is steel it has more mass making it more difficult to stop. Then the question is how rough or smooth is the surface? It will certainly travel further than the customary glass marble because it has more mass.
The Earth's gravitational force pulls the marble to the bottom of the glass. It is the same force that keeps our feet firmly on the ground.
gravity
Gravity
remove marble from tapered vase
Marble, CaCO3 will not usually scratch glass, but maybe a very soft glass. Marble has a hardness of 3 to 4, whereas glass is 4.5 to 6. (in a relative hardness scale.)
A glass marble
The marble will sink.
If a glass marble is placed on a level surface, the only forces are gravity (which prevents the marble from floating off the surface), and the lack of lateral force (it is not pushed by hand), and friction as the surface is level. One could assume, that only in a vacuum jar, would the marble have zero force. But then, surely, the earth gravity must still have some effect?
Th material can be very differernt: glass, porcelain, agate, steel, marble, etc.
no
Because the marble has a higher density than the water does
What size marble? And is it made of marble or glass?