Today we applied Newton's 2nd Law to one-dimensional problems. Homework is p. 126-127 Problems #1-4.
0 Comments
Today we looked at our lab data, discussed what the slope of the graph represents. And talked about what the y-intercept and x-intercept tell us about our experiment. If you did not finish the graph and answer the lab packet questions in class, you should finish that for homework and hand it in tomorrow.
We are currently working on a lab to determine the relationship between force and acceleration. We will (attempt) to finish the lab on Tuesday 11/21. We will discuss the results on Monday 11/27 and the lab packet with graph will be due on Tuesday 11/28.
Today we completed the free body diagram packet. Tomorrow we will begin a lab on Newton's 2nd Law.
Today we worked on test corrections for the 2 dimensional motion test. You can earn back 1/2 of the points that you missed by doing test corrections. Your corrections must have the following:
- be done on a separate piece of paper (neatly) - analyze your original solution and EXPLAIN what you did wrong IN TERMS OF PHYSICS (see example below) - rework the problem correctly showing all work and the correct answer Staple your corrections to the FRONT of your original test and turn in NO LATER THAN the beginning of the period on Monday 10/16. NO LATE WORK WILL BE ACCEPTED! Test Corrections (thanks to tregphysics for the example) Test corrections are more than simply marking the right answer on your paper. You must analyze your solution and write about what you did wrong and how you can fix it while focusing your discussion on the physics of the problem. Here's an example of a poor error analysis: I drew the line on my velocity graph above zero, and I should have drawn it below. The analysis above doesn't actually discuss any physics. It simply states where a line should be drawn. That's not physics! Here's a more thorough analysis... I sketched a positive, constant velocity by drawing the line on my velocity graph above zero. I drew that because I thought that the ball wasn't accelerating. However, the ball is rolling down a ramp while moving to the left. This means that the ball is accelerating and the velocity is changing, not constant, and increasing to the left. Since it's increasing to the left, the line should be drawn as getting more and more negative. The above analysis references both how the line should be drawn on the graph and it discusses the physics of the situation. If you're not sure whether or not you've done a thorough enough job, then just ask me, and I'll happily help out. Today you investigated forces and how force affects motion using a bowling ball and a mallet. Then we talked briefly about Newton's First Law (law of inertia). Tomorrow we will do test corrections, and continue with forces on Wednesday.
The test on Thursday will cover 2 dimensional kinematics, which includes finding vector components, adding vectors graphically and using components, projectile motion, relative motion. Here are some helpful videos if you are struggling with some of these concepts:
Projectile Motion Horizontal practice problems Angled practice problems Relative Motion Vectors The solutions to the quiz are available in the google drive folder. The homework solutions (p. 84 # 52-54 and p. 80 #1,3,4,6,9,14,15,16) are available in G.D. also. The solutions to the projectile practice problems are available. Today we talked about relative velocity. You should try one of the following problems for homework tonight: p. 82 #53 or 54. Tomorrow we will review for the test on Thursday. The test will cover: finding components of vectors, adding vectors using components, 2 dimensional motion, projectile motion, relative motion.
Today you worked in your group to come up with a process/procedure to determine the launch speed of a marble in a marble shooter. You should have a written procedure, labeled sketch of your setup, and data to support your calculation of the launch speed. Tomorrow I will give you and angle, and a target. You must calculate where to place the shooter so that the marble hits the target. Successful hits will earn a physics buck.
Today we worked together on the projectile motion practice problems. Answers are at the back of the packet. Solutions to the problems are avialable in google drive.
|
Reminders:
10/16/2018 - Test on one dimensional kinematics (tentative)
Archives
October 2018
Categories |