Today you are completing Lab: Coefficient of Static Friction. Please check your pre-lab #11 with me before moving on. Have me check off your lab when you are completely done, even if you have to finish at home over the weekend.
Your homework is Force TIPERs #4.
Friday, September 29, 2017
Thursday, September 28, 2017
More Practice
Today we did another problem together on the board:
You then had more work time.
Homework: p.117 #30 & 51
Wednesday, September 27, 2017
Friction Practice
Today we first went through a problem together:
The rest of the period was yours to work, get help, or have your lab checked.
Homework: Friction TIPERs #3 + p.118 #39, 43
Monday, September 25, 2017
Friday, September 22, 2017
Practice Problems
I feel that everyone needs to practice more force problems before we make them even more complicated by adding friction. So today was a work day. I checked your labs from earlier in the week while you worked on a new problem set:
p.114 MC #10 and Conceptual #1 + p.116 #21, 24, 26, 29, 38
p.114 MC #10 and Conceptual #1 + p.116 #21, 24, 26, 29, 38
Thursday, September 21, 2017
Inclined Planes + More Practice
Today's Bellwork: What was wrong with the setup for the lab on Monday/Tuesday? Answer: we said that the net force on the cart was equal to the weight of our hanging object. That would only be true if the acceleration of the hanging object was zero, which it was not.
This means the actual, measured acceleration was smaller than the math predicted it would be. This effect is more pronounced at smaller cart masses (or larger values of 1/m). This tipped your best fit line for a vs. (1/m) down, decreasing the magnitude of its slope and therefore decreasing your calculated value for the mass of the hanging object.
After that big discussion, we went through how to deal with inclined planes. There is only one major change:
After you tip the axes you proceed pretty much the same as yesterday.
Hopefully you started your homework in class:
p. 117 #27 & 28
This means the actual, measured acceleration was smaller than the math predicted it would be. This effect is more pronounced at smaller cart masses (or larger values of 1/m). This tipped your best fit line for a vs. (1/m) down, decreasing the magnitude of its slope and therefore decreasing your calculated value for the mass of the hanging object.
After that big discussion, we went through how to deal with inclined planes. There is only one major change:
After you tip the axes you proceed pretty much the same as yesterday.
Hopefully you started your homework in class:
p. 117 #27 & 28
Wednesday, September 20, 2017
Solving Newton's 2nd Law Problems
Today we went through a method of solving word problems that involve Newton's 2nd Law:
Notes: Solving Newton's 2nd Law Problems
We may or may not have gotten to all of the examples, depending on the class. What we didn't get to we will finish tomorrow. We also may or may not have gone over what was wrong with the lab setup from Monday/Tuesday; if we didn't cover that in your class period today, we will tomorrow.
Homework is p. 116 #17 & 25
Notes: Solving Newton's 2nd Law Problems
We may or may not have gotten to all of the examples, depending on the class. What we didn't get to we will finish tomorrow. We also may or may not have gone over what was wrong with the lab setup from Monday/Tuesday; if we didn't cover that in your class period today, we will tomorrow.
Homework is p. 116 #17 & 25
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