Flashcards in Chapter 7 Deck (15)

Loading flashcards...

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