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← Topic 13 overviewTOPIC 13 ASSESSMENT

Gravitational fields

CIE-style questions assess inverse-square gravity, field strength, potential, orbits and escape.

Objective question 1

Newton's gravitational force varies with separation r as:

Objective question 2

Gravitational field strength is force per unit:

Objective question 3

With zero at infinity, potential around an isolated mass is:

Objective question 4

Field strength is related to potential by:

Objective question 5

For circular orbits around one mass:

Structured question 1

Calculate field strength at radius 2.0 × 10⁷ m from a mass 6.0 × 10²⁴ kg. Use G = 6.67 × 10⁻¹¹.

Structured question 2

Calculate gravitational potential at that point.

Structured question 3

Calculate escape speed from that point.