A rock of mass m = 2.5 kg is tied to the end of a string of length L=1.2m.Theotherendofthe string is fastened to a ceiling, and the rock is set into motion so that it travels in a horizontal circle of radius r = 0.70 m.
a) Draw a picture showing the motion of the rock. Give both a top view and a side view.
b) What are all the forces on the rock? Add them to your pictures in part (a). Then draw a free-body diagram for the rock.
c) Find the vertical and horizontal components of all the forces on the rock.
d) Apply Newton's second law in both the vertical (y) and the horizontal directions. What is the acceleration along y? Find the tension in the string.