Give an example of an unbalanced forces acting on an object

Newton's law of universal gravitation states that the force f between two masses, m1 and m2, is given below, where g is a constant and d is the distance between the masses. find an equation that gives an instantaneous rate of change of f with respect to d. (assume m1 and m2 represent moving points.)

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

Which model displays the change in a gas when the temperature of the gaseous system decreases?