Physics 2011 Chapter 8 Rotational Motion

Front 1

Tangential Speed

Back 1

The linear speed tangent to a curved path, such as in a circular motion

Front 2

Rotational Speed

Back 2

The number of rotations or revolutions per unit of time; often measured in rotations or revolutions per second or minute

Front 3

Rotational Inertia

Back 3

The property of an object that measures it resistance to any change in its state of rotation : if at rest, the body tends to remain at rest, if rotating, the body tends to remain in rotation until acted upon by an external net torque

Front 4

Torque

Back 4

The product of force and lever-arm distance, which tends to produce rotation

Front 5

Center of Mass

Back 5

The average position of the mass of an object. The CM moves as if all external forces acted at this point

Front 6

Center of Gravity

Back 6

The average position of weight or the single point associated with an object where the force of gravity can be considered to act

Front 7

Equilibrium

Back 7

The state of an object where it is not acted upon by an external net force or net torque

Front 8

Centripetal Force

Back 8

A force directed towards a fix point, usually causes rotation
F=mv^2/r

Front 9

Centrifugal Force

Back 9

An outward force apparent in a rotating frame of reference. It is apparent in the sense that it is not part of an interaction but is a result of rotation - with no reaction-force counterpart

Front 10

Angular Momentum

Back 10

The product of a body's rotational inertia and rotational velocity about a particular axis. For an object that is small compared with th radial distance, it can be expressed as the product of the mass, speed, and the radial distance of rotation

Front 11

Conservation of Angular Momentum

Back 11

When no external torque acts on an object or a system of objects, no change of angular momentum can occur. Hence, the angular momentum before an event involving only internal torques or no torques is equal to the angular momentum after the event