PHSX 211 10th Edition Lecture 15 Outline of Last Lecture Practice ProblemsI. Draw a free body diagram of Tarzan swinging from a vine right after he steps off a branchand when we is at the lowest point in his swing.II. If you are twirling a ball on a swing vertically, what is the minimum speed at the top of the circle to keep the ball going? (Using variables)III. If you are driving a car with your crush sitting to your right, which way should you turn so they slide into you? If the static friction coefficient is .4 and the velocity is 18 m/s, what is the maximum radius you can make while turning?Outline of Current Lecture Practice ProblemsI. If you have a car on a banked curve traveling at a fixed velocity, describe the possible forces of friction.II. Write an equation for finding the velocity for the general case above.III. What are the angular velocity and the tangential acceleration for the objects below?Current LecturePractice ProblemsIV. If you have a car on a banked curve traveling at a fixed velocity, describe the possible forces of friction.a. If the velocity is at a maximum, meaning that if the car were to go any faster the car would start spiraling up the banked curve, then the force due to friction is pointing downward parallel to the slope because it is keeping the car from spiraling up the bank.b. If the velocity is at a minimum, meaning that if the car were to go any slower the car would start spiraling down the banked curve, then the force due to friction is pointing upward parallel to the slope because it is keeping the car from spiraling down the bank. c. If the velocity is neither at a maximum nor a minimum and is a general case, thenthe force due to friction is zero.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.V. Write an equation for finding the velocity for the general case above.Fradial=m v2r, Fz=Fnormal−w=0Fnormal+Ffriction=m v2r, Ncos(θ)=¿w , Nsin(θ)=m v2r, N=mgcos(θ)mgcos(θ)sin(θ)=m v2rrg∗tan(θ)=¿ v√¿VI. Are the angular velocity and the tangential acceleration for the objects below positive ornegative?a. 2.Speed increasingTraveling clockwise3.Speed decreasingTravelingcounterclockwise4.Speed decreasingTraveling clockwise1.Speed increasingTravelingcounterclockwiseb. 1: angular velocity is positive, tangential acceleration is positivec. 2: angular velocity is negative, tangential acceleration is negatived. 3: angular velocity is positive, tangential acceleration is negativee. 4: angular velocity is negative, tangential acceleration is
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