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5 Newtonian world and astrophysics

Quick questions on Gravitational fields: Newton's law, field strength, potential and orbits - OCR A-Level Physics A

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is gravitational field strength?
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Field strength is a vector pointing towards the mass producing the field; field lines are radial for a point mass and parallel near a surface.
What is q1?
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State Newton's law of gravitation in words. [2 marks]
What is q2?
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Calculate the gravitational force between two 5.0×103 kg5.0 \times 10^{3}\ \text{kg} masses 2.0 m2.0\ \text{m} apart. Take G=6.67×10−11 N m2 kg−2G = 6.67 \times 10^{-11}\ \text{N m}^2\ \text{kg}^{-2}. [2 marks]
What is q3?
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State two features that distinguish a geostationary orbit. [2 marks]

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