Answer:
# Newton's Law of Universal Gravitation
import math
print("This program will calculate the gravitational force between two objects")
# Gravitational Constant
G = 6.67408
while True:
try:
m1 = float(input("\nInput mass of first object (in kilograms): "))
break
except ValueError:
print("Invalid input!")
while True:
try:
m2 = float(input("Input mass of second object (in kilograms): "))
break
except ValueError:
print("Invalid input!")
while True:
try:
d = float(input("Distance between the objects (in meters): "))
break
except ValueError:
print("Invalid input!")
force = G * (m1 * m2) / math.pow(d, 2)
print("The gravitational force between these two objects is {0} newtons!".format(force))