HSC Together Year 12 Physics: Gravitational Field Strength at any Point

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# Gravitational Field Strength at any Point

This is part of the HSC Physics syllabus Module 5: Advanced Mechanics.

Newton’s law of gravitation, states that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

So let’s learn to apply Newton’s law of gravitation to:

• Predict the gravitational field strength at any point in a gravitational field
• Predict the gravitational field strength on the surface of a planet

Gravitational Field follows this equation:

g = \frac{GM} {r^2}
• g is the gravitational field strength
• G is the gravitational constant
• M is the mass of the plant

Gravitational field strength is:

• Proportional to the mass of the orbital body.
• Inversely proportional to the radius squared

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