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Mini-Quiz of Center of Mass Definitions by Ron Kurtus - Succeed in Understanding Physics. Key words: CM, center of gravity, force, acceleration, Earth, Moon, Sun, orbit, rotate, physical science, School for Champions. Copyright © Restrictions

Mini-Quiz: Center of Mass Definitions

by Ron Kurtus (revised 31 May 2011)

Take this Mini-Quiz to check your understanding of the lesson material.

1. If a spherical object had a greater density of mass on one side, how would that affect its CM?

The CM would be shifted toward the more dense area

The CM would remain at the geometric center, since the object is a sphere

The CM would be shifted toward the less dense area

2. For two spheres, if the M = 3m, what would R_m equal?

1/3 of R_M

3 times R_M

3 plus R_M

3. Where is the CM between Earth and a space station in orbit around the Earth?

Close to the center of the space station

Halfway between the Earth and the space station

Close to the center of the Earth

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

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Know what words mean

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Resources and references

Author's Credentials

Websites

Center of Mass Calculator - Univ. of Tennessee - Knoxville (Java applet)

Center of Mass - Wikipedia

Gravitation Resources

Books

Top-rated books on Simple Gravity Science

Top-rated books on Advanced Gravity Physics

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Where are you now?

School for Champions

Physics topics

Mini-Quiz: Center of Mass Definitions

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Gravity and Gravitation

• Overview of Gravity and Gravitation

Gravitation topics

• Overview of Gravitation
• Direction Convention for Gravitational Motion
• Gravitation Resources

Theories

• Theories of Gravitation
• Law of Universal Gravitation
• Universal Gravitation Equation
• General Relativity Theory of Gravitation
• Quantum Theory of Gravitation
• Effect of Dark Matter and Dark Energy
• Gravitation as a Fundamental Force

Principles

• Equivalence Principles of Gravitation
• Gravitation and Electrostatics
• Gravitational Speed
• Gravitational Potential Energy

Applications

• Gravitational Force Between Two Objects
• Cavendish Experiment
• Influence of Gravitation in the Universe
• Gravitation Causes Tides on Earth

Center of Mass

• Overview of Gravitation and Center of Mass
• Center of Mass Definitions
• Center of Mass Location and Motion
• Relative Motion and Center of Mass
• Center of Mass Motion Components
• Center of Mass and Radial Motion
• Center of Mass and Tangential Motion

Orbital motion

• Derivation of Orbits Around Center of Mass
• Orbital Motion Relative to Other Object
• Circular Planetary Orbits
• Length of Year for Planets in Gravitational Orbit
• Effect of Velocity on Orbital Motion

Escape velocity

• Overview of Gravitational Escape Velocity
• Gravitational Escape Velocity Derivation
• Escape Velocity with Saturn V Rocket
• Effect of Sun on Escape Velocity from Earth
• Gravitational Escape Velocity for a Black Hole

Gravity

• Gravity topics
• Overview of Force of Gravity

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