The cards Question What is density? Tap to flip Answer The mass of a material per cubic metre (m³) or per cubic centimetre (cm³). Question What equation is used to calculate density? Tap to flip Answer density = mass ÷ volume Question What is the unit of density when mass is in kilograms and volume is in cubic metres? Tap to flip Answer Kilograms per cubic metre, written kg/m³. Question What is the unit of density when mass is in grams and volume is in cubic centimetres? Tap to flip Answer Grams per cubic centimetre, written g/cm³. Question What equation gives the volume of a regular cuboid? Tap to flip Answer volume = length × width × height Question Which instrument measures the dimensions of a regular cuboid accurately? Tap to flip Answer Vernier callipers. Question Which device measures length to a very high precision? Tap to flip Answer A micrometer. Question Is an object's density the same thing as its mass or weight? Tap to flip Answer No. Density is mass divided by volume, so it should not be confused with how heavy the object is. Question How does the volume of water displaced by a submerged object compare with the object's volume? Tap to flip Answer They are equal. Question What is a displacement can? Tap to flip Answer A can with a spout, used to measure the volume of an object submerged in it. Question What is a fluid? Tap to flip Answer A liquid or a gas; it can flow because its particles can move around each other. Question How do the particles in liquids and gases move? Tap to flip Answer Very quickly and randomly, in every direction. Question How does the spacing of particles in a gas compare with that in a liquid? Tap to flip Answer Liquid particles are very close together; in a gas the gaps are much larger than the particles themselves. Question How does the pressure at one point in a fluid vary with direction? Tap to flip Answer It does not: it is the same size in every direction. Question How do the particles of a fluid exert pressure on a surface? Tap to flip Answer By colliding with the surface. Question What equation is used to calculate pressure? Tap to flip Answer pressure = force ÷ surface area Question Does the pressure at a given depth in a liquid depend on the shape of the container? Tap to flip Answer No. At the same depth the pressure is the same whatever the container's shape. Question Why does the pressure in a fluid increase with depth? Tap to flip Answer The weight of the fluid above pushes the particles closer together. Question What is upthrust? Tap to flip Answer An upward force on an object in a liquid, caused by the pressure difference between its top and bottom surfaces. Question On which part of an object in a fluid does the pressure push with more force? Tap to flip Answer On its lower part, which is what causes upthrust. Question When does an object float in water? Tap to flip Answer When its density is less than the density of water. Question Which two particle properties make a material's density greater? Tap to flip Answer A greater mass of each particle and particles packed closer together. Question Why is ice less dense than liquid water? Tap to flip Answer Its crystal structure fixes the particles further apart than they are in water. Question Do sub-microscopic particles have mass and volume? Tap to flip Answer Yes, and their mass and spacing affect the density of the substance. Question What happens to the particles when a fluid is heated? Tap to flip Answer They move faster and push each other further apart. Question How does heating a fluid change its density? Tap to flip Answer The fluid becomes less dense. Question Why does hotter fluid rise through cooler fluid? Tap to flip Answer Because the hotter fluid is less dense. Question What is a convection current? Tap to flip Answer Movement of a fluid caused by density differences within it, transferring energy as hotter fluid rises to cooler areas. Question What does 'random motion' describe for particles in a fluid? Tap to flip Answer Particles moving at a range of speeds in all directions. Question Is heat a substance that flows from place to place? Tap to flip Answer No. Heating makes particles move more quickly, and this can change the density of a fluid. Question Which three changes increase the pressure of a gas in a container? Tap to flip Answer A higher temperature, a greater mass of gas, or a smaller volume. Question How does raising the temperature of a gas affect its particles? Tap to flip Answer It increases their average speed. Question What happens to the pressure of a gas at fixed volume when its particles move faster? Tap to flip Answer The pressure increases. Question What is the particle model? Tap to flip Answer A scientific model that uses the idea of moving particles to explain how matter behaves. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Physics Unit Particle explanations of density and pressure Exam boards AQA, Edexcel, OCR Tiers foundation and higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Physics lesson by Oak National Academy licensed under Open Government Licence (OGL)
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