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Here is a straightforward worksheet on Universal Gravitation. Example:
1. Martha (50 kg) is attracted to Stewart (70 Kg) who sits 4 m away. What is the
gravitational attraction between them? G=6.67 x 10-11
ans: (6.67 x 10-11)(50)(70) / (4)(4) = 1.46 x 10-8 N.
2. Stewart (70 Kg) is attracted to Ms. Little (60 Kg) who sits 2 m away. What is the
gravitational attraction between them?