Ballistic pendulum as illustrated in Figure 1 below is a classical method of measuring the speed of bullets. This technique, which is commonly used in investigation of bullet speeds, relies heavily on the basic laws of conservation in physics.
Figure 1 Ballistic Pendulum Set-up
Figure 2 illustrates how the experiment is executed chronologically from the time the ‘bullet’ is launched to the time it ceases travelling at the maximum angular displacement. In the illustration, the bullet of mass, m and initial velocity, v hits a stationary pendulum cup and it is embedded in it to form ...