13. Mary spins a ball in a horizontal circle on a massless string. Karen has a similar ball but wants to spin hers faster. What could Karen do to make it easier to start spinning the mass from rest? a. Use a lighter ball b. Spin the ball on the moon c. Make the string longer d. Use a heavier ball 14. A 2.0 N force F is applied to a bar that can pivot around its end as shown below. The force is parallel to the bar and is r= 0.50 m away from the end. What is the torque on the bar? a. O Nm b. 1.0 Nm F c. -1.0 Nm d. 2.0 Nm

13. Mary spins a ball in a horizontal circle on a massless string. Karen has a similar ball but wants to spin hers faster. What could Karen do to make it easier to start spinning the mass from rest? a. Use a lighter ball b. Spin the ball on the moon c. Make the string longer d. Use a heavier ball 14. A 2.0 N force F is applied to a bar that can pivot around its end as shown below. The force is parallel to the bar and is r= 0.50 m away from the end. What is the torque on the bar? a. O Nm b. 1.0 Nm F c. -1.0 Nm d. 2.0 Nm