1) For an object to move in uniform circular motion, it must move with a) constant speed b) constant velocity c) constant direction d) constant momentum 2) In circular motion, the direction of velocity changes continuously and gives rise to a center-directed acceleration called centripetal acceleration. a) False b) True 3) An object is moving in a uniform circular motion because a) its acceleration is constantly changing b) its angular velocity is constantly changing c) its angular displacement is constantly changing d) its velocity is constantly changing 4) An object moving in uniform circular motion has a constant ____. a) Acceleration b) Speed c) Force 5) Although the speed of a particle in uniform circular motion is constant, the particle accelerates because the direction of its velocity is constantly changing. a) True b) False 6) The velocity is always _____ to the line of the circle. a) outwards b) towards the centre c) tangent 7) Which of the following is the unit for angular velocity? a) rad/sec b) Joule c) Newton d) m/sec 8) Angular velocity is the rate of change of angular displacement. a) True b) False 9) Centripetal force is always directed towards the center of the circle. a) False b) True 10) What is the definition of the centripetal force? a) Any force acting on an object moving in a circle. b) A force directed towards the outside of a circle that keeps an object moving in a circle. c) A force directed towards the center of a circle that keeps an object moving in a circle. 11) What is the relationship between centripetal force and the mass of an object? a) Direct b) Inverse c) Inverse squared 12) Which of the following is the unit for centripetal force? a) metre per second b) Newton c) radian per second

Chapter 6 Circular Motion

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