Gravitation
Physics ⇒ Mechanics
Gravitation starts at 9 and continues till grade 12.
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See sample questions for grade 11
A body weighs 100 N on the surface of the Earth. What would be its weight at a height equal to the radius of the Earth above the surface?
A planet has twice the mass of Earth but the same radius. What is the acceleration due to gravity on its surface compared to Earth?
A satellite is orbiting the Earth at a height where the acceleration due to gravity is 4.9 m/s2. What is the ratio of this height to the radius of the Earth?
Calculate the escape velocity from the surface of a planet of mass 6 × 1024 kg and radius 6.4 × 106 m. (G = 6.67 × 10-11 N m2 kg-2)
Calculate the gravitational force between two 1 kg masses separated by 1 meter. (Take G = 6.67 × 10-11 N m2 kg-2)
Define gravitational potential at a point.
Describe how the value of 'g' changes with altitude above the Earth's surface.
Explain why astronauts feel weightless in a spacecraft orbiting the Earth.
Explain why the value of 'g' is less at the equator than at the poles.
If the gravitational force between two objects is F, what will be the force if the distance between them is reduced to half?
If the mass of one object is doubled, how does the gravitational force between two objects change?
If the mass of the Earth were doubled and its radius halved, what would happen to the acceleration due to gravity on its surface?
State Kepler's First Law of Planetary Motion.
State the Universal Law of Gravitation.
What is the formula for the gravitational force between two point masses m1 and m2 separated by a distance r?
What is the value of acceleration due to gravity at the center of the Earth?
Who formulated the Universal Law of Gravitation?
