Question 87
Your pair will need a tray to hold sand, sand, a metre rule, a 30 cm or 15 cm ruler, a balance, and various objects such as marbles and small pieces of rock. Set up the equipment as shown in the diagram. When an object is dropped into the sand, an impact crater will form. Safety: put the equipment on the floor; wear safety glasses; do not stand on tables or chairs; ensure objects fall only into the tray and keep your feet away.
