Experimental Impact of a Pendulum With the Sand

In this paper, a compound pendulum impacting a granular media is studied and the influences of initial impact velocity and impact angle are examined. The resistance forces are studied as the sum of a dynamic frictional force (velocity dependent) and a static resistance force (depth dependent). The penetrating angle is increasing with initial impact velocity as expected. However, the stopping time is decreasing with initial impact velocity for all initial impact angles in our system.