⚛️ Physics Quiz 7: Circular Motion and Gravitation

⚛️ Physics · Quiz 007

Extend Newtonian dynamics to circular motion, gravitation, orbital motion, and apparent weightlessness.

Learning goalConnect Newtonian force analysis to curved motion and gravity, including circular orbits and the meaning of apparent weightlessness.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationFor an object moving at constant speed in a circle, in what direction does its centripetal acceleration point?
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The velocity is tangent to the circle, but the acceleration points toward the path's curvature.

UnderstandingWhich statement about centripetal force is correct?
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Identify what produces the required inward net force in different physical situations.

ApplicationA 2.0 kg object moves at 6.0 m/s in a circle of radius 3.0 m. What net inward force is required?
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Use mass times speed squared divided by radius.

InterpretationAstronauts in a spacecraft in low Earth orbit appear weightless mainly because:
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Ask whether gravity disappears in orbit or whether everything is falling together.

ConnectionThe same satellite moves in a circular orbit around the same planet, first at orbital radius r and then at orbital radius 4r. Neglect other bodies. Compared with the original orbit, what happens to the gravitational-force magnitude and circular orbital speed?
Need a small nudge?

Apply the inverse-square law to force and the inverse-square-root dependence to circular orbital speed.

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