16 68. As the vector sum of all the forces acting on a mov- ing object increases, the acceleration of the object (1) decreases (2) increases (3) remains the same 69. Which graph best represents the motion of an object that has no unbalanced force acting on it? Time Time (1) (3) Time Time (2) (4) 70. Four forces act on an object, as shown in the follow- ing diagram. If the object is moving with a constant velocity, what is the magnitude of force F? 30. N 40. N 30. N 71. The following graph represents the net force acting on an object as a function of time. During which time interval is the velocity of the object constant? vilstne Force vs. Time 3F 2F 0. - F -2F -3F 1 2 3 4 5 6 Time Acceleration Force Velocity

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