Think of it this way:
A ball doesn't 'jump' it would 'bounce'.
A jump is something the object does for themselves. A human, a dog, or dolphin would jump. They would start at one position and then go up.
A bounce is usually dropped from a height. Like when you bounce a ball. It doesn't just start at the ground and jump. It uses the force of hitting the floor to come back up.
I hope this helps!
~cupcake
