Year 5 students have been learning about friction in science. To explore its effects, they conducted an experiment using jelly cubes. They tried to pick up the cubes from a paper plate but found it difficult because the cubes stuck to the plate due to the higher friction. To reduce the friction, they poured oil on the cubes, making them easier to lift. However, they soon realised that the cubes became harder to hold onto because the reduced friction made them slippery.