Lesson 40
Laminar Motion of a Rigid Body

Name:faculty Section:M2 Start Time:17:28:18 Instructor:pate Course:355

1) Suppose you have a solid sphere and a hollow sphere of the same mass and radius, as shown in the figure. You also have a stick. What sort of nondestructive experiment could you do to determine which sphere is which? (You don't necessarily have to use the stick, but you may.) Please describe the experiment in enough detail that we can tell what the outcome would be and how that would be used to figure out which is which.



2) Suppose you want to "whack" a soup can to get it to roll without first slipping. It turns out that the location of the "whack" is important. Why, do you think?

Estimate the approximate location at which a force should be applied to get the uniform disk in the figure to roll without slipping. Please explain your thoughts.



3) Which of the following does not complete the statement accurately? If two objects have the same set of principal moments of inertia, then

  1. they respond identically to applied torques.
  2. they move in exactly the same manner.
  3. they have the same principal axes.
  4. they have exactly the same shape.



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.
I received help from someone on this assignment (document in comments section).