Floating eggs 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about flotation. Question Matu showed his friends an egg trick. He had three glasses. One contained very salty water, another tap water, and the third had equal amounts of very salty water and tap water. He then lowered an egg into each glass. This is what his friends saw: Glass A Glass B Glass C a) What 'kind' of water is in Glass B? Tap water. Very salty water. Half tap water and half very salty water. It is not possible to tell. b) Whether an object floats is related to the density of the liquid and the object. Explain why the egg floats in Glass B. Task administration: This task can be completed with pencil and paper or online. Level: 5 Curriculum info: Science, Knowledge, Physical World Keywords: physics concepts, density Description of task: Task: Answer questions about eggs put into water of different densities. Assessment focus: density. Curriculum Links: Answers/responses: Y11 (03/2000) a) B - Very salty water. very easy b) Answer which shows an understanding that the salty water is denser than the egg (or reverse of). difficult Diagnostic and formative information: Common error a) 13% of students selected option A - Tap water. Making lead float Where will the wood float?
