This set is currently a work in progress. It will cover terms and concepts from A Beka Book Physics: The Foundational Science, Chapter 13: "Rotary Motion" (pages 186-205).

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• ### angular motion

term that describes any body or particle moving around an axis

### axis

term for a center of rotation

### circular motion

term that describes a particle orbiting an external axis, like the planets orbiting the sun

### rotary motion

term that describes a particle spinning on its own internal axis, like the sun

### s

abbreviation for arc length

### θ (theta)

Greek letter that indicates an angle

### ω (omega)

Greek letter that stands for angular velocity

### α (alpha)

Greek letter that stands for angular acceleration

### I

abbreviation for rotational intertia

### τ

abbreviation for torque

### L

abbreviation for angular momentum

### arc length

term for the linear distance from one point to another on a circular path

### rim speed

term for the linear speed of a point on the rim of a rotating body

term for the measure of an angle that, when its vertex is set upon the center of a circle, subtends an arc equal in length to the radius of that circle

### angular displacement

term for the amount of rotation accomplished by a rotating body

### angular velocity

term for the change in an object's angular displacement per unit time

### average angular velocity

term for angular displacement divided by time

### angular acceleration

term for a change in angular velocity

### linear

The farther a point is from the center of rotation, the greater the _____ distance.

### tangent

term for a straight line that is perpendicular to a given point's radius on the circle

### rotational inertia

term for a body's resistance to rotary motion

### mass

Rotational inertia depends on how ___ is distributed.

### moment of inertia

another name for rotational inertia

### I=mr^2

inertia equation

### radius of a force (torque arm)

term for a vector directed from the center of rotation to the point where the force is applied, with a magnitude equal to the distance between these points

### torque (moment of a force)

term for the quantitative measurement of rotational motion caused by an applied force

### τ=Iα

equation for the law of torque

### angular acceleration

For a body of given rotational inertia, changes in torque bring proportional changes in ____ ____.

### angular momentum

term for rotary momentum

### flywheel

term for a heavy spinning disk contained in many machines

### right-hand rule

rule that says that if you curl the fingers of your right hand in the direction of rotation, your thumb will stick out in the direction of angular momentum

### gyroscope

term for any solid object rotating about a fixed axis

Example: