Students had some difficulties with the assigned HW problems. I gave students time in class to work on the problem set, and then went over some of them in class. Most students finished all the problems and checked their answers against my answer sheet.
Assigned problems 3,7,8,14,24 on Applying Newton's Laws problem sheet.
Thursday, November 13, 2008
Wednesday, November 12, 2008
Wednesday, November 12, 2008 - Blocks 1 and 3
Go over test.
Force plate demo: Ask students to predict what the Force vs Time graph would look like for someone jumping up into the air. Sketch predictions on whiteboard.
Do demo - discuss.
Go over elevator problems on whiteboard.
Show inclined plane problem first with no friction and then with friction. Show how to determine angles and use problem solving strategy.
Inclined plane cart demo: Ask students to predict what the displacement vs time, velocity vs time, and acceleration vs time graphs would look like for cart on track with motion sensor. Do they predict the same slope (acceleration) for the velocity vs time graph up and down? Show that the slopes are different because on the way up friction is opposite the component of weight but on the way down the friction force is along the component of weight. The net forces are different in both cases.
Show how we can actually calculate the coefficient of friction for the rolling cart.
Hand out Newton's Laws Practice Problems and Applying Newton's Laws problem sets. Assign problems 8,9,10,11 on Practice Problem sheet. Ask in particular that they do the problem on getting the car out of the mud. Do this problem on board first thing Thursday.
Force plate demo: Ask students to predict what the Force vs Time graph would look like for someone jumping up into the air. Sketch predictions on whiteboard.
Do demo - discuss.
Go over elevator problems on whiteboard.
Show inclined plane problem first with no friction and then with friction. Show how to determine angles and use problem solving strategy.
Inclined plane cart demo: Ask students to predict what the displacement vs time, velocity vs time, and acceleration vs time graphs would look like for cart on track with motion sensor. Do they predict the same slope (acceleration) for the velocity vs time graph up and down? Show that the slopes are different because on the way up friction is opposite the component of weight but on the way down the friction force is along the component of weight. The net forces are different in both cases.
Show how we can actually calculate the coefficient of friction for the rolling cart.
Hand out Newton's Laws Practice Problems and Applying Newton's Laws problem sets. Assign problems 8,9,10,11 on Practice Problem sheet. Ask in particular that they do the problem on getting the car out of the mud. Do this problem on board first thing Thursday.
Saturday, November 8, 2008
Friday, November 7, 2008 - Blocks 1 and 3
Test on Newton's First and the easier parts of Newton's 2nd Law.
I cut out some of the more difficult problems that I usually included and most students were able to finish easily.
No homework over the 4 day weekend.
I cut out some of the more difficult problems that I usually included and most students were able to finish easily.
No homework over the 4 day weekend.
Thursday, November 6, 2008 - Blocks 1 and 3
Finished review for test.
Assigned questions and problems from end of chapter. Students worked on these either alone or with partner. I then went over them.
I provided extra practice worksheets and answer keys for interested students.
Last day to hand in CD 5.1
Assigned questions and problems from end of chapter. Students worked on these either alone or with partner. I then went over them.
I provided extra practice worksheets and answer keys for interested students.
Last day to hand in CD 5.1
Wednesday, November 5, 2008 - Blocks 1 and 3
Collected Air Resistance Labs.
Handed out worksheet with friction problems with both static and kinetic coefficients of friction. Students worked on the problems and then I went over them in class.
Described the microscopic causes of friction.
Showed problem with non-horizontal force (force acting upwards at some angle to the horizontal) and showed how this decreased the normal force and thus decreasing the friction force. Related this to blocking in football.
Reviewed topics for test.
Put out extra worksheets for interested students to try at home.
Handed out worksheet with friction problems with both static and kinetic coefficients of friction. Students worked on the problems and then I went over them in class.
Described the microscopic causes of friction.
Showed problem with non-horizontal force (force acting upwards at some angle to the horizontal) and showed how this decreased the normal force and thus decreasing the friction force. Related this to blocking in football.
Reviewed topics for test.
Put out extra worksheets for interested students to try at home.
Tuesday, November 4, 2008 - Blocks 1 and 3
Students worked in pairs to do the Air Resistance Lab. The lab itself did not take too long so students had time to work on the write-up. Lab write-up due on Wednesday.
Monday, November 3, 2008 - Blocks 1 and 3
Handed out packet on solving problems using Newton's laws. The packet showed a worked example focusing on the problem solving strategy. Gave students time to work on the problems, emphasizing the problem solving strategy.
If students did not finish, I asked them to finish for homework and hand in on Tuesday.
If students did not finish, I asked them to finish for homework and hand in on Tuesday.
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