Quiz (See related pages) 1 If the sum of the external torques acting on a body or system of bodies is zero, the angular momentum is also zero. A) True B) False 2 An angle of 1 rad is an angle whose arc distance s is equal in length to the radius R. A) True B) False 3 Angular frequency and angular velocity are representations of the same physical quantity. A) True B) False 4 Both angular acceleration and tangential acceleration represent a rate of change in angular velocity. A) True B) False 5 The rotational kinetic energy of an object on a rotating platform decreases as the object moves toward the center of rotation. A) True B) False 6 A solid disk of mass M will roll to the bottom of an incline quicker than a circular hoop of the same mass and diameter. A) True B) False 7 Torque is the rotational analog of linear force. A) True B) False 8 A resultant torque will produce an angular acceleration directly proportional to the applied torque and inversely proportional to the total mass of the object. A) True B) False 9 The angular impulse is equal to a change in rotational kinetic energy. A) True B) False 10 For a rotating rigid body, the ratio of linear speed to angular speed is equal to the radius of revolution. A) True B) False 11 Increasing the angular speed of a rotating body will not cause an increase in A) rotational kinetic energy B) angular momentum C) the momentum of inertia D) linear speed 12 Which of the following would not necessarily cause angular acceleration? A) Change in frequency B) Change in angular displacement C) Change in angular velocity D) Change in linear speed 13 A point on the edge of a rotating disk of radius 8 m moves through an angle of 2 rad. The length of the arc described by the point is A) 4 m B) 0.25 m C) 16 m D) 4 Π rad 14 If the frequency is 2 rev/s, the angular speed is A) 4 π rad/s B) 2 π rad/s C) π rad/s D) 4 rad/s 15 A flywheel increases its angular speed from 4 to 12 rad/s in 4 s. Its angular acceleration is A) 3 rad/s² B) 12 rad/s² C) 4 rad/s² D) 2 rad/s² 16 A drive shaft has a frequency of rotation of 1200 rpm. The linear speed of flyweights positioned 2 ft from the axis is approximately A) 80 Π ft/s B) 40Π ft/s C) 40 ft/s D) 20 ft/s 17 A circular disk has a moment of inertia of 2 kg * m² and a rotational kinetic energy of 400 J. The angular speed must be approximately A) 200 rad/s B) 40 rad/s C) 400 rad/s D) 20 rad/s 18 Which of the following objects has the largest moment of inertia, assuming they all have the same mass and the same radius? A) A solid sphere B) A solid disk C) A circular hoop D) A solid cylinder 19 A circular grinding disk of radius 0.5 ft has a moment of inertia of 16 slug * ft² and is rotating at 600 rpm. The frictional force applied to the edge of the disk, to stop the wheel in 10 s, is approximately A) 201 lb B) 100 lb C) 402 lb D) 32 lb 20 A wheel with angular momentum of 10 kg * m²/s has a moment of inertia equal to 0.5 kg * m². Its angular velocity is A) 40 rad/s B) 20 rad/s C) 5 rad/s D) 0.5 rad/s 21 The angular displacement in is the ratio of the length of arc to its . 22 If the sum of the external acting on a body or system of bodies is zero, the angular remains unchanged. This is a statement of the conservation of . 23 Rotational work is the scalar product of and . 24 A resultant torque applied to a rigid body will always result in a(n) that is directly proportional to the applied and inversely proportional to the body’s . 25 The USCS units of the moment of inertia are . 26 The ratio of the tangential acceleration to the is equal to the radius of revolution. 27 In rotational motion, the final angular velocity is equal to the initial plus the product of the angular and . 28 The is the radial distance from the center of rotation to a point at which the total mass of the body might be concentrated without changing its . 29 The linear speed divided by the radius of rotation is the of the body. 30 Rotational power is equal to the product of and angular .
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