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Flashcards in Chapter 7 Deck (15)
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1

Angular Measure

-Radius: constant over time
-Theta (0): changes over time
*Circular motion

2

Arc Length

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

3

Radian

1 Radian= 57.3 degrees

4

Angular Speed

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

5

Right hand rule

-Hand towards self=Clockwise= negative
-Hand away from self=Counterclockwise= positive

6

Tangential Speed

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

7

Period

-T
-Time it takes for one rotation, cycle, or revolution
-SI: s, s/cycle

8

Frequency

-The number of rotations per second
-f
-SI: 1/s, hertz (HZ)

9

Uniform Circular Motion

-Tangential speed= constant

10

Centripetal Acceleration

-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

Inertia

-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

Centripetal Force

-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

Radians per second to revolutions per minute

-1 rev= 6.28 radians
-60 seconds= 1 minute

14

Kepler' Laws

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

Gravitational Force

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