A tennis ball and a spoon sit on a table, exactly 1 meter apart.

1. The ball exerts a gravitational force on the spoon
   1. which is zero
   2. which attracts the spoon towards the ball
   3. which repels the spoon away from the ball
2. If we replace the single tennis ball with 2 tennis balls in the same place,
   1. the force on the spoon remains the same
   2. the force on the spoon doubles
   3. the force on the spoon quadruples
3. Joe measures the force on the spoon to be 8 nN. He then moves the spoon so it is 2 meters away from the balls. As a result,
   1. the force becomes 2 nN
   2. the force becomes 4 nN
   3. the force remains 8 nN