Circular Motion and Gravitation.pdf

9 suppose that you are a driver or passenger in a car

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9. Suppose that you are a driver or passenger in a car and you travel over the top of a small hill in the road at a high speed. As you reach the crest of the hill, you feel your body still moving upward; your gluts might even be pulled off the car seat. It might even feel like there is an upward push on your body. This upward sensation is best explained by the ______. a. tendency of your body to follow its original upward path b. presence of an upward force on your body c. presence of a centripetal force on your body d. presence of a centrifugal force on your body 10. Darron Moore is on a barrel ride at an amusement park. He enters the barrel and stands on a platform next to the wall. The ride operator flips a switch and the barrel begins spinning at a high rate. Then the operator flips another switch and the platform drops out from under the feet of the riders. Darron is plastered to the wall of the barrel. This sticking to the wall phenomenon is explained by the fact that ________. a. the ride exerts an outward force on Darron that pushes him outward against the wall b. Darron has a natural tendency to move tangent to the circle but the wall pushes him inward c. air pressure is reduced by the barrel's motion that causes a suction action toward the wall d. the ride operator coats the wall with cotton candy that causes riders to stick to it Learning to Learn Strategy Always take time to reflect upon your own belief system that governs how you interpret the physical world. Be aware of your personal "mental model" which you use to explain why things happen. The idea of this physics course is not to acquire information through memorization but rather to analyze your own preconceived notions about the world and to dispel them for more intelligible beliefs. In this unit, you will be investigating a commonly held misconception about the world - that motion in a circle is caused by an outward (centrifugal) force. This misconception or wrong belief is not likely to be dispelled unless you devote some time to reflect on whether you believe it and whether it is intelligible. After considering more reasonable beliefs, you will be more likely to dispel the belief in a centrifugal force in favor of a belief in an inward or centripetal force.
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Circular and Satellite Motion Name: © The Physics Classroom, 2009 Page 7 The Centripetal Force Requirement Read from Lesson 1 of the Circular and Satellite Motion chapter at The Physics Classroom : MOP Connection: Circular Motion and Gravitation: sublevels 2 and 4 Review Questions: 1. The net force acting upon an object is _________ as the direction of the object's acceleration. a. in the same direction b. in the opposite direction c. ... nonsense! There is no simple rule which relates the direction of the a and F net vectors.
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