Curriculum
Course: American System Physics
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American System Physics

A Physics Toolkit

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Representing Motion

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Accelerated Motion

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Forces in One Dimension

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Displacement and Force in Two Dimensions

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Motion in Two Dimensions

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Gravitation

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Rotational Motion

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Momentum and Its Conservation

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Energy and Its Conservation

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Thermal Energy

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States of Matter

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Vibrations and Waves

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Sound

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Fundamentals of Light

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Reflection and Refraction

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Interference and Diffraction

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Electrostatics

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Electric Current and Circuits

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Magnetic Fields

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Electromagnetic Induction and Electromagnetism

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Quantum Theory and the Atom

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Solid-State Electronics

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Nuclear and Particle Physics

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Quiz

7.0 Gravitation: Planetary Motion and Using the Law of Gravitation – Check yourself

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Gravitation American Physics check yourself quiz: free practice for American System Physics. Work through this Gravitation American Physics check yourself quiz and get instant feedback on every answer. If you get stuck, review the 7.3 Gravitational Fields, Weight and Tides — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 10
  • Passing grade: B+
  • Time limit: 10 minutes
Start Quiz
1.
Astronauts float in the ISS because
no gravity
free fall
magnetism
air pressure
2.
Which statement best describes Gravitational field?
g = GM/r²; force per unit mass.
Universal gravitational constant, 6.67 × 10−11 N·m²/kg².
F = Gm1m2/r².
Planets move in ellipses with the Sun at one focus.
3.
A probe records g at several altitudes during its climb (table). Which reading is anomalous?
3000 km
1000 km
2000 km
4000 km
4.
Students drop balls of different mass from the same height (table). What do the results suggest?
Heavier balls fall faster, so gravity depends on inertia only
Lighter balls fall faster because they have less inertia
All masses fall with the same acceleration, consistent with inertial mass equalling gravitational mass
The results cannot be used because the masses differ
5.
A student records the mass and weight of the same object on three bodies (table). Which row contains an error?
The Earth row
The Mars row
The Moon row
None of the rows
6.
Physicists quote some key gravitational values from memory. Which pairing of quantity and value is correct?
Geostationary period – 12 h
Escape velocity from Earth – about 11.2 km/s
G – 9.8 N·m²/kg²
g at Earth's surface – 6.67 N/kg
7.
Why does an astronaut inside an orbiting spacecraft feel weightless?
There is no gravity in space
The spacecraft's engines cancel gravity
Her mass becomes zero in orbit
She and the spacecraft are both in continuous free fall, so the floor pushes on her with no force
8.
Ocean tides result mainly from differences in the _____'s gravitational pull across Earth.
Moon
Sun
Earth
wind
9.
Astronauts in orbit float because they have travelled beyond the reach of Earth's gravity. True or false?
True
True only when they are on the far side of the Moon
False, because gravity still acts strongly there; they float because they are in free fall
False, because they float because the air pressure is low
10.
The escape velocity from Earth is about 11.2 km/s. True or false?
False
False, because it is about 7.7 km/s
True
True only when the object is massive
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Part of Gravitation — see every lesson and quiz in this unit.
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