Floating bodies — Flashcards
Telangana Board · Class 9 · Physical Science
20 flashcards for Floating bodies (Telangana Board Class 9 Physical Science) to test yourself on key terms and facts.
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A wooden block floats on water but an iron nail sinks. However, a large iron ship floats. Why does this happen?
Answer
The ship floats because it's designed as a hollow structure that displaces a large volume of water. The weight of water displaced by the ship's submerged part equals the ship's total weight, creating …
What is density and how do we calculate it?
Answer
Density is the mass of a substance per unit volume. Formula: Density = Mass/Volume. Units: g/cm³ or kg/m³. Example: If 50 cm³ of wood has mass 30g, then density = 30g/50cm³ = 0.6 g/cm³.
Why does ice float on water even though both are made of the same substance?
Answer
Ice has lower density (0.92 g/cm³) than liquid water (1.0 g/cm³). When water freezes, its molecules arrange in a hexagonal structure with more empty spaces, making ice less dense. Since ice density < …
A stone weighs 500g in air but appears to weigh only 300g when submerged in water. What is the buoyant force?
Answer
Buoyant force = Weight in air - Weight in water = 500g - 300g = 200g = 2N. This apparent loss of weight (200g) equals the weight of water displaced by the stone, demonstrating Archimedes' principle.
What is relative density and why does it have no units?
Answer
Relative density = Density of object/Density of water. It tells us how many times denser an object is compared to water. It has no units because it's a ratio of two quantities with the same units (den…
How does a lactometer detect if water has been added to milk?
Answer
Pure milk has higher density than water. When water is added to milk, the mixture's density decreases. A lactometer (hydrometer for milk) sinks deeper in the diluted milk than in pure milk, indicating…
State Archimedes' principle and give one practical example.
Answer
Archimedes' principle: When a body is immersed in a fluid, it experiences an upward buoyant force equal to the weight of fluid displaced by the immersed portion. Example: A person feels lighter in a s…
Why can we easily lift a heavy stone underwater but it feels very heavy when we take it out?
Answer
Underwater, the stone experiences buoyant force equal to the weight of water it displaces, making it feel lighter. When lifted out of water, there's no buoyant force from water, so we feel its full we…
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