Forces in Circular Motion Bookmark this page Worksheets due Dec 15, 2022 10:00 PST Completed We know that changing direction requires acceleration and thus a net force. In circular motion, we are changing direction all the time. The necessary acceleration is directed towards the center. We therefore need a net force that is directed towards the center. Newton's second law for uniform circular motion can be written as EF Fret = mac = m 22 R ?? to WQ6.10 1/1 point (graded) In this classic demo a ball is forced to undergo circular motion by the tension in a string. The tension force thus provides the necessary centripetal acceleration. The ball's motion is in the horizontal plane. On a piece of paper, draw the free-body diagrams showing all the forces on the ball at the position v shown. Type 'yes' below once you've done this. yes V WQ6.12 2/2 points (graded) A car is rolling over the top of a hill at a constant speed of v. a) At this instant, is the normal force equal to the car's weight? O Yes No V b) Why or why not? Write an equation for the normal force to explain your above answer. Define the upward direction as positive. Your equation should involve the force magnitudes w, F. for the weight, and cetripetal force respectively. w-F_C V w - Fe
WQ6.13 2/2 points (graded) When an airplane changes diection, its wings are tilted as shown. The lift force "L" acting on airplane's wings act only in a direction perpendicular to the wings. a) Draw yourself a free-body diagram for the plane at the position shown below (flying into the screen). Think about: what is keeping the plane at the same altitude (height above ground); what makes the plane move in a circle? Enter 'yes' below when you are done. yes v b) An airplane is flying in a horizontal circle with an airspeed of 140 m/s. What is the radius of the circle? The wings of the plane are tilted at 40° with respect to the horizontal m- direction. Enter your response in units of meters [m] 2380 V 2380