Sciences - Co-ordinated (Double) - 0654 CIE

Density

Bayani Gaba-gaba

Lead is called heavy and cork is called light, yet a tiny lead pellet weighs far less than a whole cork life-ring. What we really mean is that lead packs much more mass into each unit of volume. That idea, mass per unit volume, is density, and it lets you predict whether a pebble sinks, why an iron ship floats, and which liquid settles on top when two will not mix.

In this lesson you will define density, learn the equation that links mass, volume and density, and measure it for a liquid, a regular solid and an awkward irregular solid using displacement. You will then use density data the way examiners ask: to decide whether an object floats or sinks, and whether one liquid floats on another.

Manufura

  1. Define density as mass per unit volume; recall and use the equation m ρ = V
  2. Describe how to determine the density of a liquid, of a regularly shaped solid and of an irregularly shaped solid which sinks in a liquid (volume by displacement), including appropriate calculations
  3. Determine whether an object floats based on density data
  4. [Supplement] Determine whether one liquid will float on another liquid based on density data given that the liquids do not mix

Darasin Sauti

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Takardar Darasi

Engineers work out the weight of a bridge from the volumes and densities of its materials before a single beam is cut. A diver chooses weights so their average density matches the water. A cook knows oil floats on vinegar. All of these are density at work, and in the exam density is one of the most reliable sources of marks because the equation is short and the reasoning about floating is logical, not memorised.

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Nazarin Darasi

Barka da kammala darasi akan Density. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

  1. Density is defined as A. mass times volume B. mass divided by volume C. volume divided by mass D. weight divided by area Answer: B
  2. A block has mass 240 g and volume 30 cm3. Its density is A. 0.125 g/cm3 B. 8 g/cm3 C. 80 g/cm3 D. 7200 g/cm3 Answer: B
  3. A stone of mass 75 g raises the water in a measuring cylinder from 40 cm3 to 65 cm3. Its density is A. 1.15 g/cm3 B. 3.0 g/cm3 C. 1.88 g/cm3 D. 25 g/cm3 Answer: B
  4. An object will float in a liquid if the object's density is A. greater than the liquid's density B. equal to its own weight C. less than the liquid's density D. equal to the liquid's mass Answer: C
  5. The density of water is 1.0 g/cm3. In kg/m3 this is A. 0.001 B. 1 C. 100 D. 1000 Answer: D

Yi aikin wadannan tambayoyi a cikin manhaja

Yi aikin wadannan tambayoyi a cikin manhaja

Littattafan da ake ba da shawarar karantawa

Cambridge IGCSE Physics Coursebook
Cambridge IGCSE Physics Coursebook
Sunaƙa: Third edition
Mai wallafa: Cambridge University Press
Shekara: 2021
ISBN: 978-1-108-88807-3
Bayanan bayanin.: Endorsed coursebook with full coverage of the 0625/0972 syllabus, worked examples and practical skills.
Cambridge IGCSE Physics
Cambridge IGCSE Physics
Sunaƙa: Third edition
Mai wallafa: Hodder Education
Shekara: 2014
ISBN: 978-1-4441-7642-1
Bayanan bayanin.: Endorsed textbook covering the Core and Supplement content with worked examples and questions.

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