Today we began a lab to investigate the relationship between the kinetic and gravitational potential energy of a ball tossed in the air.
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Today we solved work and energy problems on whiteboards. No homework this weekend!
Today we learned about gravitational potential energy, and how to calculate it. Then you worked on a worksheet that reviewed the concepts we have learned so far - 1) work done by a constant force 2) kinetic energy and the work-kinetic energy theorem and 3) gravitational potential energy.
Today was a work day to work on work problems (who says we don't have fun in physics?!!)
NOTE to 3rd period: You can skip #25 and #27 in the homework as they contain a concept we did not cover!
Today we learned how the net work done on an object is related the kinetic energy of the object. Homework is p. 187 Focus #8,9 and p. 188 #13-23 odd. Check the homework folder for posted solutions (see button on the right). Today we talked about the concept of "work". We were able to define what "work" means in a physics sense, and also how to calculate work. Homework is p. 187 Focus #1,2, and p. 188 Problems #1-11 odd.
Solutions for all the problems sets for chapter 4 are now in the google folder. You can find the following solutions:
CH4 test review problems Equilibrium Problems Inclined Plane Problems Friction Problems Gravity Problems F=ma Problems Your test is tomorrow. All equations will be given to you. You do not get to use a note sheet for this exam. Here is the study guide for Thursday's test. You should be familiar with everything on the list. Today we finished the example problems with objects in equilibrium and non-equilibrium applications. Tomorrow we will review for the test on Thursday.
Today we solved force problems together on whiteboards. The problems involved friction, tension, and pulleys. No homework this weekend. We will finish the forces unit next week and have a test on Thursday!
If you missed the pulley unit, here is a powerpoint that takes you through calculating the mechanical advantage of a hauling system. If you play the ppt in presentation mode, it will take you through the process step by step. Today we talked about pulley systems, and how to determine the mechanical advantage of a hauling system. Your challenge is to design a hauling system with a minimum mechanical advantage of 3:1 or better (more is better, so think big!). Tomorrow we will build our systems and determine the actual mechanical advantage.
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Reminders:
10/16/2018 - Test on one dimensional kinematics (tentative)
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