Fill a pan with sand to a depth of about 2.5 cm. Smooth the surface. Then tap the pan lightly a couple of times so the sand settles evenly.
Take the pan outside, or set it on newspaper or a large towel.
Choose two marbles or small rocks. One should be heavier than the other.
Plan an experiment to investigate how the mass or speed of the marble influences the crater’s size.
Answer the following questions. Then, report the procedure and results of your experiment.

What is the purpose of your investigation?

Which variables will you hold constant?

Which variables will you change in a controlled manner?

Which variables will you measure to determine the influence of those that you have changed?

How did you carry out the experiment? What were your results? What is your conclusion? How is your conclusion related to energy?