Daily Quiz # 8b Circular Motion II (and Newton's Laws)

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The first three questions refer to the material you were to read in preparation for the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle. Questions 4 is your opportunity to suggest what we should emphasize today and how.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page.

1.

A disk is attached to a string that passes through a hole in the center of table top and attached to the other disk beneath the table. Assuming the surface is friction free, the angular velocity of the object is 1 rad/s, and the radius of the circular path of the object is 2 m, calculate the tension T in the string.

2. If a 1000 kg auto exits onto a circular off-ramp with a radius of 100 m at 40 m/s. A friction force between the tires and the road keep it from sliding off the road. Is this a static or kinetic friction force? What factors need to be considered to determine the magnitude of this force?

3.

If a ball moves in a horizontal circle with constant speed the tension in the string is a constant. But what if the ball moves in a vertical circle with constant speed?

The tension is the same everywhere.

The tension is greatest at A.

The tension is greatest at B and D.

The tension is greatest at C.

4. Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.