The gravitational force between two point masses is proportional to the product of the masses and inversely proportional to the square of their separation
The gravitational force between two masses outside a uniform field is defined by Newton’s Law of Gravitation
A satellite with mass 6500 kg is orbiting the Earth at 2000 km above the Earth's surface. The gravitational force between them is 37 kN.
Calculate the mass of the Earth. (Radius of the Earth = 6400 km)
A common mistake in exams is to forget to add together the distance from the surface of the planet and its radius to obtain the value of r. The distance r is measured from the centre of the mass, which is from the centre of the planet.
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