Circular Motion and Gravitation1

# Circular Motion and Gravitation1 - Circular Motion and...

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Circular Motion and Gravitation home - about - terms - credits - feedback Physics Tutorial Minds on Physics Multimedia Physics Studios Shockwave Physics Studios The Review Session 1-D Kinematics Newton's Laws of Motion Vectors and Projectiles Forces in Two Dimensions Momentum and Collisions Work, Energy and Power Circular and Satellite Motion Static Electricity Electric Circuits Waves Sound and Music Light and Color Reflection and Mirrors Refraction and Lenses Physics Help Curriculum Corner The Laboratory » The Physics Classroom » Review Session » Circular Motion and Gravitation Circular Motion and Gravitation Review Navigate to Answers for: Questions #1-#14 Questions #15-#28 Questions #29-#40 [ #1 | #2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 | #10 | #11 | #12 | #13 | #14 ] Part A: Multiple Choice 1. Which of the following statements are true of an object moving in a circle at a constant speed? Include all that apply. a. The object experiences a force which has a component directed parallel to the direction of motion. 2. Inertia causes objects to move in a circle. 3. There can be a force pushing outwards on the object as long as the net force in inwards. 4. Because the speed is constant, the acceleration is zero. 5. The acceleration and the net force vector are directed perpendicular to each other. 6. If the net force acting upon the object is suddenly reduced to zero, then the object would suddenly depart from its circular path and travel tangent to the circle. 7. The acceleration of the object is directed tangent to the circle. Answer: CF A is false; if the motion is in a circle at constant speed, the net force is perpendicular to the direction of motion and there is neither a component parallel nor anti-parallel to the direction of motion.) B is false; it is centripetal force which causes the circular motion. Inertia (which is NOT a force) is merely the tendency of any moving object to continue in its straight-line constant speed path. C is true; an object which moves in a circle must have a net inward force. There are many instances of individual outwards forces which are exceeded by an individual inward force (e.g., see #5 below). http://www.physicsclassroom.com/reviews/circles/cpmans1.cfm (1 of 12) [4/12/2552 19:10:05]

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Circular Motion and Gravitation D is false; acceleration occurs when there is a change in velocity. Since the direction of the velocity vector is changing, there is an acceleration - an inward acceleration. E is false; the acceleration and net force are always directed in the same direction. In this case, F and a are directed inward; this happens to be perpendicular to the tangential velocity vector. F is true; if the net force is 0 N, then the moving object will maintain its state
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## This note was uploaded on 11/18/2010 for the course CPHY 101 taught by Professor Jay during the Spring '10 term at University of Massachusetts Boston.

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Circular Motion and Gravitation1 - Circular Motion and...

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