Two objects exert a gravitational force of 4 N on each other. a. If the mass of one object is doubled, what will be the new force of gravity between the two objects? b. If both masses are doubled, what will be the new force of gravity between the objects? c. If the masses do not change, but the distance between the objects is doubled, what will be the new force of gravity between them? d. If both the masses and the distance between the objects are doubled, what will be the new force of gravity between them?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!