Multiple Choice On the blank write the CAPITAL letter of the best answer choice. Also circle the letter of the best answer. 1. The positive direction of torque is A. dependent on the direction of force C. clockwise (c.w.) B. counter-clock wise (c.c.w.) D. found by using your left hand C 2. All are true of centripetal force EXCEPT A. It's directed toward the inside of a circle. B. It keeps an object going in a circle. C. If an object goes in a circle, it creates centripetal force. D. It's the net force of an object moving in a circle. 3. You are in a large space station shaped like a gigantic, hollow inner tube. If you move toward the center of the space station, all of the following will decrease EXCEPT A. your centripetal acceleration C. the normal force acting on you B. your weight in the space station D. All of these will decrease. 4. All are examples of rotation EXCEPT A. an ice skater spinning C. the Earth going around the sun each yr B. the Earth spinning on its axis each day D. Two of these. 5. If you want to tighten a bolt with a wrench, you can increase torque in all of the following EXCEPT A. use a longer wrench C. pull harder on the wrench B. pull on the wrench closer to the bolt D. All of these will increase torque C 6. Two bugs are on a rotating CD. Bug A is 10 cm from the center, and Bug B is 20 cm from the center. The rotational speed of A is _ B. A. slower than C. the same as B. faster than D. None of these 7. Which of the following is NOT a unit of rotational speed? A. Meters per second C. Radians / second B. 60 RPM / 2TC D. Hertz / 2n 8. What is the direction of the net force on a rock rotating on a string in a horizontal circle? A. Up C. Down B. Outward D. Inward 9. If the linear velocity of an object doubles,, its centripetal acceleration will . decrease C. increase by 2x B. increase by 4x D. None of these A 10. A car can stay on the road in a curve at constant speed because A. friction pulls the car inward. C. a force pulls the car outward. B. the engine pulls the car forward. D. inertia keeps the car in the turn