Defining Gravity

What event led to an "Aha!" moment for Sir Isaac Newton? 

• He was hit by a falling apple

• He awoke from a deep sleep

• He had a dream about gravity

• He ate a delicious apple

In the experiment, the finger represented ___

• the Earth

• the force of gravity

• the penguin

• the Arctic

Gravity can be defined as the –

• force of attraction between two or more masses.

• friction created when two objects are in contact.

• energy given off by stars due to nuclear reactions.

• path an object follows as it moves through space.

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Which of the following governs the motion of our solar system?

• Magnetism

• Gravity

• Sunlight

• Friction

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Which two factors affect the strength of the gravitational pull on two objects?

• Mass and density

• Weight and density

• Weight and distance

• Mass and distance

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The gravitational attraction between two objects would increase if both masses are –

• increased, and the distance between them is increased.

• increased, and the distance between them is decreased.

• decreased, and the distance between them is decreased.

• decreased, and the distance between them is increased.

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Why do planets orbit the Sun?

• The Sun is the only celestial object that has a gravitational pull

• The Sun’s chemical composition makes it attract planets

• Only celestial bodies that emit light, like the Sun, can be at the center of an orbit

• The Sun is the most massive object in our solar system, so it exerts the greatest gravitational pull

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What is the primary force that keeps planets in orbit around the sun?

• Electromagnetic force

• Nuclear force

• Gravity

• Friction

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Which of the following best describes gravity?

• A force that repels objects from each other

• A force that attracts objects towards each other

• A force that only acts on objects with mass

• A force that only acts in a vacuum

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If the distance between two objects is doubled, how does the gravitational force between them change?

• It doubles

• It halves

• It becomes four times weaker

• It becomes four times stronger

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