Friday, October 3, 2008 - Blocks 1 and 3

Collected Vector Worksheet 4

Gave Graphical Addition of Vector Quiz
Graded Vector Worksheet 4 while students took quiz
Handed back Vector Worksheet 4. If students got it all right, then I entered it in my gradebook. If students had errors, I asked them to correct errors and hand back. Those students who did not hand it in must hand it in Monday but don't get the second chance.

Went over Graphical Addition of Vector Quiz.
If students had problems, another quiz on Monday on graphical addition of vectors.

Did example of shooting a rocket straight up (launch angle 90 deg) and hitting the ground after 8 seconds.

Re-did example, same rocket, SAME LAUNCH SPEED, but with a launch angle of 60 deg. Found vix, viy, tup, tdown, total time in air, range.

Students re-did example with launch angle of 45 deg.

Did another example of shooting a rocket off at some angle and having it hit 100 m down range after 5.2 seconds.
Found vix, viy, launch speed, launch angle, height

In block 1 handed out problem set and asked students to do problems 17-25.
Many had difficulties so in block 3 I did the problem of object shot horizontally off cliff 37 m high and landing 77 m away. Found launch velocity, time in air, vy hit, and hitting speed.

Asked Block 3 to omit prob 22