2.12 Newton’s 2nd Two Body Level 2

Pre-reading question: If two objects are connected by a string, are their accelerations the same? Explain.

Textbook reading: Section 6-4, pages 165-169 do a great job explaining how to do the problems we’ll be working on tomorrow.  Example 6-6 on pages 167-168 is just like what I do in the video. I suggest looking at it before and after watching the video.

Videos:

Newton’s 2nd Law two-body example 1:

Atwood Machine Example 1:

Textbook reading: Look at again at example 6-6 on pages 167-168. Notice that the textbook writer flips the coordinate system in x and in y. I don’t do that because I find it really hard to convince my brain that y is to the right. But if the method they use makes sense to you, it can make some problems a little easier.

Post-reading question: Try the other two Atwood’s examples. If you need help, look at example 6-7 on pages 168-169 of the textbook.

Extra Practice:

  • Problem 45 on page 181-182 (the diagram is on page 182). You can check your answer in the back of the book. THEREFORE, to receive extra credit, you must have the correct answer.
  • Problem 47 on page 182 (but the diagram is on page 181). You can check your answer in the back of the book. THEREFORE, to receive extra credit, you must have the correct answer.
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