Demonstrate how to string length and mass affect the movement of a pendulum. Simply attach strings of different lengths with different weights to the pendulum clamp and observe the differences in motion. Includes a heavy-duty pendulum clamp, a support stand with a 6 in. x 11 in. support base, and a 36 in. L rod, four 25 mm pendulum bobs with hooks (one each of aluminum, brass, steel, and zinc), one roll of thread, and one tape measure