Warmup #9

L22 Free Body Diagrams

Course

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Please type your LAST NAME and LAST FOUR SS# digits:

IN:
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) In the diagrams below, the blue arrow represents the weight W, and the red arrow represents the normal force N.

Choose the figure at the bottom of this question which represents the correct free-body diagram for yourself sitting in a seat (click the button under the correct figure).


2) Two objects, 3 kg each, are suspended from a string which is passing over pulleys as in the picture above. Tiny scales are spliced into the string as shown. The weights of the scales are small and can be neglected.

What is the reading (in Newtons) on each of the three scales?


3) A 1200 kg car traveling at 13 m/s is able to skid to a stop over a distance of 30 meters. What must be the coefficient of friction between the road and the tires for this to be possible?




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.