A force of magnitude, F is applied to a doorknob and a second force of magnitude, 2F is applied to the same door at the middle of the door Both forces are perpendicular to the door plane. Which of the following is the correct ratio between the torque of the first force and the torque of the second force? A) 1:2 B)1:1 C)2.1 D)4 1 11. A 4.0-kg block travels around a 0.50-m radius circle with an angular velocity of 12 radis Its angular momentum about the center of the circle is A) 12 kg.m2 /s B) 24 kg.m2 /s C) 48 kg.m2 /s D) 6 kg.m2/s 12. A solid sphere rolling without slipping down an incline has Aj rotational kinetic energy B) constant angular momentum C) zero external torques D) translational kinetic energy 13. A seesaw with mass x is perfectly balanced with a fulcrum in the center. If mass x changes uniformly, does the net torque change? A) Yes, because the Gravitational force increases with more mass, and torque is related to Force B) No, because the net torque is still zero despite increases in one of the individual components C) No, because it is balanced that means net torque is zero, a uniform increase in weight keeps balanced keeping net torque at zero D) Yes, any increase in weight will increase torque 14 You apply force to a wrench to tighten a bolt. The wrench breaks in half. Select the best answer for what happens next. Assume the force applied remains constant A) The torque is now half of what it was, because torque and distance are inversely proportional B) The torque is now half of what it was, because torque and distance are directly proportional C) The torque is now double of what it was, because torque and distance are inversely proportional D) The torque is now double of what it was, because torque and distance are directly proportional 15. A construction worker is worried about applying too much torque to a bolt using his wrench. What could he do to reduce his torque on the bolt? A) Increase the length of the wrench B) Increase the force on wrench C) Reduce the length of the wrench D) Reduce the friction between the bolt and wrench 16. Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail? A) the inside horse B) the outside horse C) Neither 17. Which force produces the greatest torque? A) 20N with a lever arm of 1m B) 15N with a lever arm of 3m C) 10 N with a lever arm of 4m D) 8N with a lever arm of 5m 18. A meter stick is balanced. If a 0.5 kg mass is fastened 0.3 m to the left of the fulcrum and a 0.6 kg mass is fastened 0.25 m to the right of the fulcrum, the meterstick will A) rotate counterclockwise (left) B) rotate clockwise (right) C) remain in balance D) move up and downAssessment: (Post-Test) choices Multiple Choice. Answer the question that follows Choose the best answer from the giver why are you more stable when riding a bicycle at a faster speed? A) You have more mass C) It's not easier to ride at a faster speed B) The wheels have angular momentum D) The bike has more momentum What does the rotational inertia describe? 2 A) The average position of mass in an extended object B) How the mass of an object is distributed C) How a force can rotate an object () The tendency of an object to move in a straight line 3 2600 rew/min is equivalent to which of the following? A) 2600 rad/s B) 43 3 rad/s C) 273 rad/s D) 60 radis 4. A 0. 12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11 0 rad/s, What is the wheel's average angular acceleration? A) 9.6 rad/s/s B) 4.8 rad/sis C) 3.1 rad/s/s D) 1,6 rad/s/s 5 Suppose you are rotating in a chair with 2 equal masses held in each outstretched hand and you drop them What happens to your angular velocity" A) Increase B) Decrease C) Stays the same Dj is lost 6 When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing. Select correct statement about the directions of its angular velocity and angular acceleration A) Angular velocity upwards. angular acceleration downwards Bj Angular velocity downwards, angular acceleration upwards C) Both angular velocity and angular acceleration upwards D) Both angular velocity and angular acceleration downwards 7 You exert a force on a friend who is holding a 4.0-m-long rope. Now suppose you exen the same force on your friend. but the friend is holding an 8 0-m-long rope. How will this affect the rotational acceleration? A) It will be quartered B) It will be halved C) It will double D) It will quadruple 8 The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P? A B C D 9 A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms A) her moment of inertia increases and her angular speed decreases B) her moment of inertia decreases and her angular speed increases C) her moment of inertia increases and her angular speed increases D) her moment of inertia increases and her angular speed remains the same 10. What is the rotational kinetic energy of the cylinder att = 2 s? AlZ.OJ D) It cannot be determined without knowing the rachus B)2 50 C)5.0JWhat I Can Do It's undersTORQUEable! From the lessons learned, list down 3 sports/events that utilizes the concept of Torque and briefly explain how this concept is used Sports/Events Torque Concept 2