Gravity as a Force

The amount of attraction between two objects which are not in contact with each other is known as the _________.

• Normal force

• Gravitational force

• Magnetic force

• Electrical force

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What is the proper setup of the gravitational force formula?

• F_g= Gm²/r

• F=ma

• F_g= Gr²/(m₁+m₂)

• F_g= G (m₁m₂)/r²

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What effect does increasing the distance between the two objects do to the gravitational force?

• The distance between two objects has no effect on the gravitational force

• It increases

• It stays the same

• It decreases

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When do gravitational forces exist between two objects?

• They only exist between microscopic objects.

• They are always present between any two objects.

• Gravitational forces only act on objects falling on Earth.

• They only exist for objects in space.

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Calculate the gravitational force between a 15-kg chinchilla and a 65-kg dog which are separated by 0.30 m.

• F_g = 3.7*10^-8 N

• F_g = 1.3*10¹² N

• F_g = 1.1*10⁵ N

• F_g = 7.2*10^-7 N

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What would the gravitational force be between the Sun and Mars if they were 2.3*10¹¹ m apart? The masses for the Sun and Jupiter are 1.99*10³⁰ kg and 6.42*10²³kg, respectively.

• F_g = 3.8*10¹⁵ N

• F_g = 2.8*10^-42 N

• F_g = 1.6*10²¹ N

• F_g = 4.6*10^-75 N

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• Universal gravitational constant

• Combined masses of the two objects

• Gravitational force

• Dielectric constant

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Which of the following changes would increase the gravitational force between two objects?

• Increase G

• Increase the mass

• Increase r

• Decrease G

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True or False: The gravitational force each tennis ball acts on the other is the same.

• True

• False

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When calculating the r value for gravitational force, where do we measure between two objects?

• The sum of their diameters

• The center of their masses

• The furthest reaches of their orbits

• The tips of one of their poles

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