Use the dynamic trolleys try the following scenarios and comment on your results in terms of conservation of momentum.
1. With one trolley stationary gently role a second trolley into the first making sure they do not connect.
2. With one trolley rolling slowly, role a second at a faster pace into the first
3. role two trolleys into each other from opposite directions (at similar, gentle speeds if possible)
4. With three trolleys, have two stationary, but not connected. Role the third into the back of the other two.
5. Role a trolley into a stationary trolley making sure they connect together after the collision