Question 1

Marks: 1

What is the correct relationship between the gravitational force and the distance between two point masses?

$F \propto \frac{1}{G}$
$F \propto \frac{1}{m}$
$F \propto \frac{1}{r^{2}}$
$F \propto r^{2}$

Key Concepts

Newton’s Law of Gravitation

Question 2

Marks: 1

The force, F between two point masses is 10 N. The distance, r between the two masses is doubled.

What is the new force between the two masses?

2.5 N
5 N
20 N
100 N

Key Concepts

Newton’s Law of Gravitation

Question 3

Marks: 1

The gravitational force, F_G as shown on the diagram, keeps the Earth orbiting the Sun in a circular orbit.

6-2-newtons-law-of-gravitation-sl-mcqs-easy-q3-question

What type of force is F_G?

Electrostatic force
Centripetal force
Centrifugal force
Contact force

Key Concepts

Circular Orbits

Question 4

Marks: 1

Which expression best describes the relationship between the orbital time period, T and the orbital radius, r?

$T^{3} \propto r^{2}$
$T^{2} = r^{3}$
$T^{2} \propto \frac{1}{r^{3}}$
$T^{2} \propto r^{3}$

Key Concepts

Circular Orbits

Question 5

Marks: 1

Which of the following is not an equation which can be used to calculate g, the gravitational field strength?

$g = \frac{F}{m}$
$g = \frac{G M}{r^{2}}$
$g = F m$
$g = \frac{w e i g h t}{m a s s}$

Key Concepts

Circular Orbits

Question 6

Marks: 1

Which of the following statements about gravitational force is true?

Gravitational force has a finite range
A greater gravitational force is exerted on objects with larger mass
On planets with a large value of g, the gravitational force per unit mass is smaller than on planets with a smaller value of g
An object's mass changes depending on the gravitational field strength at that point

Key Concepts

Circular Orbits

Question 7

Marks: 1

An alien of mass 100 kg lives on a planet with a gravitational field strength of 50 N kg⁻¹.

What is the weight of the alien on this planet?

5000 N
1000 N
0.05 N
100 N

Key Concepts

Circular Orbits

Question 8

Marks: 1

A commercial low-orbit space flight carries a passenger of mass 70 kg.

What is the approximate gravitational force of attraction between the Earth and the passenger?

0 N
7 N
700 N
7000 N

Key Concepts

Circular Orbits

Question 9

Marks: 1

A planet has twice the radius of the Earth and 4 times the mass. Assume the planet is spherical and of uniform density.

If the magnitude of the gravitational field strength on Earth is g, what is the magnitude of the gravitational field strength on the surface of the planet?

4g
8g
2g
g

Key Concepts

Circular Orbits

Question 10

Marks: 1

Which graph, plotted on logarithmic axes, shows Kepler's Third Law for the planets in our Solar System?

Key Concepts

Circular Orbits

DP IB Physics: SL

Topic Questions

6.2 Newton’s Law of Gravitation

Question 1

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Question 2

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Question 3

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Question 4

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Question 5

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Question 6

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Question 7

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Question 8

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Question 9

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Question 10

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