Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-9702-GF1-0031 markL1 FoundationCalculatorField strength

Gravitational field strength at a point is defined as

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SA-9702-GF1-0041 markL1 FoundationCalculatorField strength

g

at Earth's surface is

9.81

N kg⁻¹. Calculate

g

at a distance of

2R

from Earth's centre, where

R

is Earth's radius.

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SA-9702-GF1-0051 markL1 FoundationCalculatorLaw of gravitation

The distance between two masses is tripled. State the factor by which the gravitational force changes, as a decimal.

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SA-9702-GF1-0071 markL1 FoundationCalculatorField strength

Close to Earth's surface, the gravitational field lines are

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SA-9702-GF1-0091 markL1 FoundationCalculatorField strength

The unit N kg⁻¹ is equivalent to

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SA-9702-GF1-0121 markL1 FoundationCalculatorLaw of gravitation

Outside a uniform sphere, its gravitational field is the same as that of

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SA-9702-GF1-0012 marksL2 StandardCalculatorLaw of gravitation

Earth (mass

6.0\times10^{24}

kg) and the Moon (mass

7.3\times10^{22}

kg) are

3.8\times10^8

m apart. Calculate the gravitational force between them, in units of

10^{20}

N. (

G=6.67\times10^{-11}

N m² kg⁻²)

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SA-9702-GF1-0022 marksL2 StandardCalculatorField strength

Calculate the gravitational field strength at a height of

400

km above Earth's surface. (Earth: mass

6.0\times10^{24}

kg, radius

6.4\times10^6

G=6.67\times10^{-11}

N m² kg⁻²)

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SA-9702-GF1-0062 marksL2 StandardCalculatorField strength

At Earth's surface

g=9.81

N kg⁻¹ and Earth's radius is

6.37\times10^6

m. Calculate Earth's mass, in units of

10^{24}

kg. (

G=6.67\times10^{-11}

N m² kg⁻²)

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SA-9702-GF1-0081 markL2 StandardCalculatorLaw of gravitation

Earth pulls the Moon with force

F

. The Moon pulls Earth with a force of

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SA-9702-GF1-0101 markL2 StandardCalculatorLaw of gravitation

Two

10

kg spheres have centres

0.50

m apart. Calculate the gravitational force between them, in units of

10^{-8}

N. (

G=6.67\times10^{-11}

N m² kg⁻²)

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SA-9702-GF1-0113 marksL3 ExamCalculatorField strength

Mars has radius

3.39\times10^6

m and surface

g=3.72

N kg⁻¹. Calculate the height above the surface of Mars at which

g

1.00

N kg⁻¹, in units of

10^6

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