P a b m C Z X Q d R A small object of mass m is on a horizontal, frictionless surface, moving along the x axis at a speed v. Consider the points P, Q, and R, located as shown in the figure. At the moment t=0 the object is a horizontal distance b and a vertical distance a from the point P, a horizontal distance c from point Q, and a horizontal distance c and vertical distance d from point R. 1. What are the direction and magnitude of the particle's angular momentum about each of the three points, P, Q, and R? 2. Calculate the net torque on the object about each point and relate it to the change in the angular momentum. 3. Now suppose that the object experiences kinetic friction. What changes?

P a b m C Z X Q d R A small object of mass m is on a horizontal, frictionless surface, moving along the x axis at a speed v. Consider the points P, Q, and R, located as shown in the figure. At the moment t=0 the object is a horizontal distance b and a vertical distance a from the point P, a horizontal distance c from point Q, and a horizontal distance c and vertical distance d from point R. 1. What are the direction and magnitude of the particle's angular momentum about each of the three points, P, Q, and R? 2. Calculate the net torque on the object about each point and relate it to the change in the angular momentum. 3. Now suppose that the object experiences kinetic friction. What changes?