Tried to give some weight to things in these practice animations. Weight is a key area of animation and seems important to get it right. Here I drew a light droplet falling at a fair rate that speeds up in the air. Next along is some dirt that could perhaps be on a conveyor belt (which explains it moving out of shot). There is very little frames in the fall as the dirt would naturally hit the ground without any bounce. The final object is bowling balls rolling off edges. Again, there is no bounce to convey how heavy they are.
Finally I implemented some weight into a character to try exploring it further. The hammer definitely seems heavy with the way it is lifted slowly off the ground and falls at a rapid rate. I added in a more cartoon bounce back after the hit so I could get the character falling backwards, which again shows how heavy the hammer is.