Circular motion, vertical surface with kinetic friction: A small block of mass 2.0 kg slides on a horizontal frictionless surface as it travels around the inside of a hoop of radius R = 0.50 m. A view from above is shown. The coefficient of friction between the block and the hoop wall is 0.20. Therefore, the block is slowing down. a) Draw a free body diagram for the block in the position shown (you do not need to include forces perpendicular to the plane of the hoop, i.e., the weight of the block and the normal force that is caused by the horizontal frictionless surface). m b) Determine the direction of the acceleration of the block at the position shown (a numerical value for an angle is required). Note that the answer to this question does not depend on the speed of the block. c) Determine the frictional force of the wall on the block at the moment the velocity is 3 m/s.

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