Newton’s Law of Universal Gravitation. AP Physics C Mrs. Coyle. Isaac Newton. 1666, England (45 years after Kepler). . Questions. If the planets are orbiting the sun , what force is keeping them in orbit? What force keeps the moon in its orbit? Could the force of gravity be universal?.
AP Physics C
G= 6.67 x 10-11 N m2 / kg2
The gravitational force place the role of the centripetal force.
a)If the mass of one is doubled and the distance between them is reduced to ½d, how does the force change?
b) If both masses are doubled and the distance is also doubled how does the force change?
Ans: a)2.50x10-5 N towards the 500kg object, b)0.245m