Following on from the movement tutorial. Lets look at what happens if our sprite was to collide with another.
Below is a backdrop with a rocket sprite and some rocks.
We need to make the rocket sprite move when the arrow keys are pressed.
Essentially what we are doing here when the rocket touches the rocks, it says 'BOOM' for two seconds. I have left this tutorial like this so you can make improvement as the whole purpose of scratch is to learn and a good way to learn is to experiment.
Try adding a second costume for the rocket sprite and change this when they touch, perhaps also add some sound.
Please feel free to use, modify and contribute to this further.