1Chapter 6: Circular Motion and Gravitation We briefly discussed motion at constant speed in a circle.Now that we know about forces, we can look again at this.We’ll also introduce Newton’s theory of gravitation which often causes circular motion.Uniform Circular Motion - a reminderAn object moving at constant speed around a circular path has an accelerationpointing radially inwardno acceleration component parallel to the velocity?- that would change the speed!we found a formulaUniform Circular Motion -dynamicsSo what happens if we remove the force? e.g. what if the string is cut?vote:1.particle stops where it is2.particle moves at constant speed along the radial direction3.particle moves at constant speed in the tangential directionExample 6.1 Model airplane on a stringFly a propeller-driven model airplane on a 5.00m string in a horizontal circle. The airplane, which has mass 0.500kg flies level and at constant speed and makes one revolution every 4.00 seconds. How hard must you pull on the string to keep the plane flying in a circle?radial accelerationspeed
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