Chapter 5 Density and Buoyancy

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Presentation transcript:

Chapter 5 Density and Buoyancy Grade 8 Science Chapter 5 Density and Buoyancy

copy Chapter 5.1 Density and Buoyancy

Density – The amount of mass in a certain volume of a substance copy Page 130 Density Density – The amount of mass in a certain volume of a substance A “heavy” substance has a high density A “light” substance has a low density

copy Page132 Density Density can be described as the crowdedness of the particles in a substance

Density and States of Matter copy Page135 Density and States of Matter In general, gases are less dense than liquids, and liquids are less dense than solids.

Density and States of Matter copy Page135 Density and States of Matter The only way a pure substance can change density is to change state. Solid gold is MORE dense than molten (liquid) gold.

Density: How are Mass and Volume Related? copy Chapter 5.2 Density: How are Mass and Volume Related?

Density – Mass vs Volume copy Page 137 Density – Mass vs Volume Mass – The amount of particles in a substance Volume – The amount of space occupied by a substance

Density – Mass vs Volume copy Page 137 Density – Mass vs Volume Formula for Density: Density (D) = Mass (m) Volume (V)

Density – Mass vs Volume copy Page 137 Density – Mass vs Volume Example The density of an object having a mass of 10g and a volume of 2 cm3 is… D = = = 5 g/cm3 m 10g V 2cm3

Buoyancy: The “Anti-Gravity” Force copy Chapter 5.3 Buoyancy: The “Anti-Gravity” Force

copy Page 144 Why things Float… Floating – when an object does not fall or sink, but suspends in a fluid

Gravity – force that pulls objects down copy Page 144 Buoyancy Force Gravity – force that pulls objects down Buoyancy – force that pushes objects up