Universal law, free fall, mass vs weight, thrust and pressure, buoyancy.
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Q1 · Gravitation · EASY
A stone is dropped from the top of a building and it takes 4 seconds to reach the ground. Taking g = 10 m/s², what is the height of the building?
Q2 · Gravitation · MEDIUM
An object weighs 60 N on Earth. What will be its mass on the Moon? (Take g on Earth = 10 m/s²)
Q3 · Gravitation · HARD
A wooden block of volume 0.02 m³ and density 800 kg/m³ is floating in water (density 1000 kg/m³). What fraction of the block's volume remains above the water surface?
Q4 · Gravitation · EASY
The value of acceleration due to gravity on the surface of the Moon is approximately one-sixth of that on Earth. If an object weighs 60 N on Earth, what will be its weight on the Moon?