Gravity (Leaving Cert Physics): Quizzes

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Gravity
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What did Newton's 1666 theory of gravitation unify?

Terrestrial & celestial mechanics

What is Newton's law of universal gravitation?

F=Gm1m2d2F = G\frac{m_1m_2}{d^2}

How does gravitational force relate to the masses involved?

Directly proportional to their product

If distance between two masses doubles, what happens to gravitational force?

Becomes 4 times smaller

What is the value of the universal gravitational constant GG?

6.7×10−116.7 \times 10^{-11} N m² kg⁻²

What is the key difference between mass and weight?

Mass constant, weight varies w/ location

Which formula gives the weight of an object?

W=mgW = mg

What is the value of gg at sea level on Earth?

9.89.8 m s⁻²

What is gravitational field strength defined as?

Force per unit mass

What is the SI unit of gravitational field strength?

N kg⁻¹

What is Earth's escape velocity?

Approx. 11,20011,200 m s⁻¹

How does escape velocity depend on the escaping object's mass?

Independent of object's mass

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Density, Pressure, and Gravity

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Density, Pressure, and Gravity

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