Axis
the straight line around which an object may rotate or revolve
centrifugal force
an apparent outward force on a rotating or revolving body ("center-fleeing") Not a real force.
centripetal force
a center-directed force that causes an object to move in a curved (sometimes circular) path ("center-seeking")
centripetal acceleration
acceleration directed toward the center of the circle....rate at which the direction of the moving object changes
frequency
the number of rotations or revolutions per unit of time
linear speed
the path distance moved per unit of time
period
the time it takes for one full rotation or revolution
revolution
motion of an object turning around an axis outside (or external to) the object
rotation
the spinning motion that takes place when an object rotates about an axis located within the object (spin)
rotational speed
the number of revolutions per unit of time "angular speed
tangential speed
the speed of an object moving along a circular path "linear speed
tangent
perpendicular to the radius of the circle
acceleration
rate at which linear speed changes
torque
a quantity that measures the ability of a force to rotate an object around some axis
?
rotational speed symbol
?
Greek letter "Tau"....symbol for torque
?
Symbol for period
f
symbol for frequency
Hz (Hertz)
unit for frequency
s (seconds)
unit for period
N?m
unit for torque (newton-meter)
rps (rotations per second)
rpm (rotations per minute)
unit for rotational speed
rotational inertia (moment of inertia)
property of matter which resists changes in rotational motion
I
symbol for rotational inertia ( moment of inertia)
requirements for 100% equilibrium (non-accelerated motion)
1. No net torque acting on an object
2. No net force acting on an object
L
symbol for angular momentum
conservation of angular momentum
When no net external torque is acting on one or more objects....the angular momentum (L) is conserved.
Meaning...if rotational inertia changes for an object while it is spinning...the rotational speed changes so that the momentum value is conserved.
m/s
unit for tangential speed
translational motion
straight line motion
rotational motion
circular motion (motion on a complete circular path or a partial circular path)
center of gravity
The point at the center of an object's weight distribution (may be located where no material exists, as in a boomerang or a wheel)
Uniform circular motion
circular motion that has constant rotational speed but experiences rotational acceleration because the object is continually changing its direction