Students will watch an impressive (and potentially messy!) demonstration of inertia.
Here, an egg is supported over a glass of water by a toilet paper tube. When the supporting tube is moved away quickly, the egg drops straight into the cup.
The explanation has to do with inertia. Very little sideways force is applied to the egg as the tube is quickly knocked out of the way. The only force left to act on the egg is gravity, so the egg drops straight down.