Any two objects with mass will be attracted to each other by gravity, which is a force that arises purely from mass. Any mass is possessed of gravity, and any two masses will be drawn toward each other by this force. But note that gravity isn't strong enough to cause, say, a rock to be attracted to a brick wall. They are attracted to each other by their mutual gravity, but that mutual gravity cannot overcome the other forces acting on them. The gravitational forces acting in this case are very small when we look at the "big picture" here.
Earth has a mass that exerts a gravitational force, pulling objects towards its center. This force is what causes objects to fall towards the ground when dropped. The strength of the gravitational pull depends on the mass of the objects and the distance between them and Earth's center.
Yes. All objects have mass, because all objects contain matter. Mass is just a measure of how much matter is contained within an object. Therefore, any object, from the smallest speck of dust to giant stars, have mass.
The gravitational force of Earth is approximately 9.81 meters per second squared (m/s^2) at its surface. This force is what keeps all objects on Earth's surface grounded and is responsible for the weight of objects.
The four types of forces are gravitational force (attraction between objects with mass), electromagnetic force (interaction between charged particles), strong nuclear force (holds atomic nuclei together), and weak nuclear force (responsible for radioactive decay).
Yes, I am exerting a gravitational force on the Earth, but it is incredibly minuscule due to my small mass. The force is too weak to have any noticeable effect on the Earth's motion or other objects.