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AP Physics C: Mechanics 6.6 A Describe the Motions of a System Consisting of Two Objects or Systems Interacting Only Via Gravitational Forces Questions

Analyze two-body gravitational motion by connecting orbital radius with energy and speed, applying conservation laws, and testing escape conditions.

Syllabus
Effective Fall 2024
Course
AP Physics C: Mechanics

Exam points

  • relate U = -GMm/r, K = -U/2 and E = U/2 to compare circular orbits
  • calculate external work from the change in total energy when transferring between circular orbits
  • use energy and angular momentum conservation to compare speed and energy around elliptical orbits
  • apply the zero-total-energy threshold to find escape speed or the residual speed at infinity

AP Physics C: Mechanics 6.6 A Describe the Motions of a System Consisting of Two Objects or Systems Interacting Only Via Gravitational Forces Questions question 1

[Maximum number: 1]

A comet moves in an elliptical orbit around the Sun. Which of the following is at a maximum when the comet is at its farthest distance from the Sun?

A

Kinetic energy of the comet

B

Speed of the comet

C

Acceleration of the comet

D

Gravitational potential energy of the Sun comet system

E

Total energy of the Sun-comet system Questions 19－20

Figure for Question AP Physics C: Mechanics 6.6 A Describe the Motions of a System Consisting of Two Objects or Systems Interacting Only Via Gravitational Forces Questions question 1 — AP Physics C: Mechanics

The graph above shows velocity as a function of time for a cart moving on a straight，horizontal track．

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