gc textbook chapter 8 Rotational Motion (id: e1fc72b4d)

[问答题]
The angular velocity of a wheel +b o1)gk p(ecnc7m( d -svh1jsrotating on a horizon +0d gxsplw.)stal axle points west. In what direction is the linear velocity of a point on the top of the wheel? If the angular acceleration points east, describe the tangent+.dwg) lpx ss0ial linear acceleration of this point at the top of the wheel. Is the angular speed increasing or decreasing?

参考答案:
See the diagram.  To the left is west, the direction of the angular velocity.  The direction of the linear velocity of a point on the top of the wheel would be into the paper, which is north.  If the angular acceleration is east, which is opposite the angular velocity, the wheel is slowing down – its angular speed is decreasing.  The tangential linear acceleration of the point on top will be in the opposite direction to its linear velocity – it will point south.


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