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Grade_11_General_Science_Floating_and_Buoyancy_Presentation.pptx

General Science in Grade-11

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DESIGNING PRACTICAL ACTIVITIES: FLOATING AND BUOYANCY GRADE 11 GENERAL SCIENCE
LEARNING OBJECTIVES • • Explain floating • Describe effects of shape, mass, volume • Design investigation • Draw conclusions
REVIEW •What is buoyancy?
What is buoyancy? •Buoyancy is the upward force that a fluid (like water or air) exerts on an object immersed in it, which opposes the object's weight.
• Why does a steel ship float while a nail sinks? •A steel ship floats because its hollow shape holds a large amount of air.This makes its average density less than water, while a solid steel nail has a high density and sinks
ARCHIMEDES' PRINCIPLE • An immersed object experiences an upward buoyant force equal to the weight of displaced fluid.
PHYSICAL PROPERTIES • Mass,Volume, Shape, Density
DENSITY • Density = Mass/Volume Lower density than water float →
SHAPE MATTERS • Clay ball sinks; clay boat floats.
MASS MATTERS • Increase mass without volume density → increases.
VOLUME MATTERS •Increase volume with same mass density decreases. →
ACTIVITY 1 • Foil boat challenge.
SAMPLE DATA • Record shape, coins held, float/sink.
ACTIVITY 2 • Increase mass using sand/water.
ACTIVITY 3 • Compare clay ball, disk, boat.
VARIABLES • Independent, dependent, controlled variables.
DESIGN STEPS • Problem, hypothesis, variables, procedure, data, conclusion.
EXAMPLE INVESTIGATION • Does changing shape affect floating?
APPLICATIONS • Ships, submarines, life jackets, bridges.
Grade_11_General_Science_Floating_and_Buoyancy_Presentation.pptx