When a pair of 10-N forces act on a box of candy, the net force on the box is Zero About 14 N 20 N Any of the above depending on the directions of forces The minimum number of forces that act on a book resting on a table is 1 2 3 4 None of the above The amount of force needed to sustain motion of a rock in outer space is A force equal to its weight. A force less than its weight if friction is absent. None of these

1. When a pair of forces act on a box of candy, the net force on the box isAny of the above depending on the directions of forcesExplanation: If the forces are acting in the same direction, the net force will be the sum of the forces, which is . If the forces are acting in opposite directions, the net force will be the difference of the forces, which is . Therefore, the net force depends on the directions of the forces.2. The minimum number of forces that act on a book resting on a table is1Explanation: The minimum number of forces acting on a book resting on a table is 1, which is the gravitational force acting on the book. This force is responsible for keeping the book in contact with the table.3. The amount of force needed to sustain motion of a rock in outer space isA force equal to its weight.Explanation: In outer space, there is no air resistance or friction to oppose the motion of the rock. Therefore, the force needed to sustain the motion of the rock is equal to its weight.