Chapter 9 Flashcards
Torque
defined to be the product of a force F and its moment arm R, produces rotation
moment of inertia
describes how mass is distributed about an axis and has units of kg*m^2
angular velocity
v=rw
angular acceleration
a=ra
linear momenetum
mv
rotational kinetic energy
1/2Iw^2
conservation of angular momentum
Li=Lf, if friction is neglected it is conserved
rotational speed
the number of rotations or revolutions per unit of time
rotational inertia
property of an object to resist changes in its rotational state of motion
what does rotational inertia depend on
mass, axis it rotates
the greater RI,
the greater difficulty in stopping
center of mass
the average position of all the mass that makes up the object
center of gravity
the average position of the weight distribution
locating cg of uniform
midpoint
locating cg of freely suspended
point of suspension
stability
balance, location of CG is important for this
centripetal force
any force directed toward a fixed center
centrifugal force
outward force
