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Flashcards in Chapter 7 Deck (15)
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1
Q

Angular Measure

A
  • Radius: constant over time
  • Theta (0): changes over time
  • Circular motion
2
Q

Arc Length

A

-Distance traveled along the circular path, theta is what defines this

3
Q

Radian

A

1 Radian= 57.3 degrees

4
Q

Angular Speed

A
  • Rotational speed, how much angle is being covered
  • SI: radians/second
  • Common: revolutions
  • 1 rev= 2pi radians
5
Q

Right hand rule

A
  • Hand towards self=Clockwise= negative

- Hand away from self=Counterclockwise= positive

6
Q

Tangential Speed

A
  • The linear speed of something moving along a circular path
  • Farther from center= moves faster
  • SI: m/s
7
Q

Period

A
  • T
  • Time it takes for one rotation, cycle, or revolution
  • SI: s, s/cycle
8
Q

Frequency

A
  • The number of rotations per second
  • f
  • SI: 1/s, hertz (HZ)
9
Q

Uniform Circular Motion

A

-Tangential speed= constant

10
Q

Centripetal Acceleration

A
  • Acceleration directed toward the center of a circular path
  • Created by change in magnitude of velocity, direction of velocity, or both
  • SI: m/s^2
11
Q

Inertia

A

-A property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force

12
Q

Centripetal Force

A
  • The net force on an object in uniform circular motion
  • Any combination of forces: gravity, friction, etc.
  • SI: N
  • Does not change KE or speed of object
13
Q

Radians per second to revolutions per minute

A
  • 1 rev= 6.28 radians

- 60 seconds= 1 minute

14
Q

Kepler’ Laws

A
  1. Planets move in elliptical orbits, with the sun at one of the focal points (the law of orbits)
  2. A line from the sun to a planet sweeps out equal areas in equal lengths of time (the law of areas)
    • The closer to the sun, greater the arc length, faster it has to move
  3. The square of an orbital period of a planet is directly proportional to the cube of the average distance of the planet from the sun (T^2 is directly proportional to r^3)
15
Q

Gravitational Force

A
  • Field force
    • Exert forces without coming into contact
  • The mutual force of attraction between particles of matter