Upthrust in Fluids and Archimedes Principle and Floatation — Flashcards
ICSE · Class 9 · Physics
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State the definition of upthrust or buoyant force.
Answer
The upward force exerted on a body by the fluid in which it is submerged is called the upthrust or buoyant force. Symbol: F_B. Unit: newton (N).
State the definition of buoyancy.
Answer
Buoyancy is the property of a liquid to exert an upward force on a body immersed in it.
What is Archimedes' principle?
Answer
Archimedes' principle states that when a body is immersed partially or completely in a liquid, it experiences an upthrust equal to the weight of the liquid displaced by it. It applies to liquids and g…
Why does a body appear lighter when immersed in water?
Answer
A body appears lighter because water exerts an upward force on it. This upthrust reduces the apparent weight. The apparent loss in weight is equal to the upthrust.
A body weighs 200 gf in air and 190 gf in water. Find the loss in weight and upthrust.
Answer
Given: Weight in air = 200 gf, weight in water = 190 gf Step 1: Loss in weight = 200 gf - 190 gf = 10 gf Step 2: Upthrust = loss in weight = 10 gf Answer: Loss in weight = 10 gf, upthrust = 10 gf…
A stone has mass 200 g and volume 80 cm³. It is fully immersed in water. Find the mass of water displaced.
Answer
Given: Volume of stone = 80 cm³ Since the stone is fully immersed, volume of water displaced = 80 cm³ Density of water = 1 g cm^-3 Step 1: Mass of water displaced = density × volume Step 2: Mass = 1 g…
A stone of mass 200 g and volume 80 cm³ is fully immersed in water. Find its weight, upthrust, net downward force, and acceleration. Take g = 10 m s^-2.
Answer
Given: mass of stone = 200 g = 0.2 kg, volume = 80 cm³, density of water = 1 g cm^-3, g = 10 m s^-2 Step 1: Weight of stone = m g = 0.2 kg × 10 m s^-2 = 2 N Step 2: Mass of water displaced = 80 g = 0.
State the formula for density and name its SI unit.
Answer
Density = mass / volume Formula: ρ = M / V SI unit: kg m^-3 CGS unit: g cm^-3…
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