Fluid Mechanics
Physics ⇒ Mechanics
Fluid Mechanics starts at 8 and continues till grade 12.
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See sample questions for grade 10
A balloon filled with helium rises in air. Explain why this happens.
A block of wood floats on water with 60% of its volume submerged. What is the density of the wood if the density of water is 1000 kg/m³?
A cube of side 0.1 m is completely submerged in water. What is the buoyant force acting on it? (Density of water = 1000 kg/m³, g = 9.8 m/s²)
A hydraulic press has a small piston of area 0.01 m² and a large piston of area 0.5 m². If a force of 100 N is applied to the small piston, what is the force exerted by the large piston?
A liquid flows through a pipe that narrows from a cross-sectional area of 0.04 m² to 0.01 m². If the speed in the wider section is 2 m/s, what is the speed in the narrower section?
A tank is filled with oil to a height of 2 m. If the density of oil is 800 kg/m³ and g = 9.8 m/s², what is the pressure at the bottom of the tank due to the oil?
Describe how a drinking straw works using the concept of pressure.
Describe the difference between laminar and turbulent flow.
Explain why a person feels lighter when swimming in water.
Explain why a ship made of steel floats on water, but a small steel ball sinks.
State Bernoulli's principle.
State Pascal's law.
