Warmup. Be prepared to answer the following: What is required to turn an object travelling in a straight line? What is required to rotate a stationary object? What is the difference between a rotation and a revolution, and how are they related to different kinds of velocities?.
Be prepared to answer the following:
DECEMBER 12TH, 2011
v = r
Torque (Ft = Fd)
Center of mass and stability
A center of mass is the average point of mass in an object.
It’s possible to be located outside the object!
Stability is determined by whether or not the center of mass is above the confines of the supporting base.
Torque is a twisting force that causes an object to rotate.
Unlike Work, the Force and the Distance in Torque are in perpendicular directions.
How is the water removed from clothes during the spin cycle of a washer?
Think carefully before answering . . . Does the centripetal force throw water off the clothes?
NO. Actually, it is the LACK of a force that allows the water to leave the clothes through holes in the circular wall of the rotating washer.