What is the name given to the force exerted by the first object on a second object

Explain why electric current cannot exist if a current doesn't have a voltage source.

What causes the development of most clouds and precipitation in the atmosphere?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.