Motion in Gravitational Fields (HSC SSCE Physics): Quizzes

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The Gravitational Force and the Gravitational Field
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What is Newton's Law of Universal Gravitation?

F=GMmr2F = \frac{GMm}{r^2}

What is the value of the universal gravitational constant GG?

6.67×10−116.67 \times 10^{-11} N kg−2^{-2} m2^2

If the distance between two objects doubles, what happens to the gravitational force?

It becomes one-quarter as strong

Which statement correctly describes gravitational force?

It is always attractive

How do the forces between Earth and Sun compare according to Newton's third law?

Equal magnitude, opposite direction

How is gravitational field strength defined?

Force per unit mass

What are the units of gravitational field strength?

N kg−1^{-1} or m s−2^{-2}

What is Earth's gravitational field strength at its surface?

9.89.8 m s−2^{-2}

In the equation g=GMr2g = \frac{GM}{r^2}, what does rr represent?

Distance from centre of object

When is the near-Earth approximation valid?

For small altitude changes

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