October 12, 2012

Physics

Collect the Lab.

Bellwork:
    1.  Consider a situation where 3 forces are acting on a point.  The sum of the force is zero.  The first     force has a magnitude of 80 N acting in a direction of 35 degrees north of east.  The second force has     a magnitude of 29 degrees acting in a direction of 12 west of north.  Where and how large will the third     force be to maintain the zero net force equilibrium.

    2.  Josh of the Jungle is swinging from tree to tree using the local native vines.  Each vine can hold a     maximum force of 900 N.  If Josh, whose mass is 85 kg, pulls the vine pack to an angle of 56     degrees,     will he make it across the pit of crocodiles or will he be lunch?

Discuss friction and statics.  Go over the concepts and calculations.

Hand out the friction and statics packet.

HW: Finish the packet problems.  Be sure you have read chapter 4 and also read chapter 5.  Do the
questions 35, 36, 37 in chapter 4 and 2,4,6,9,13,14,17-21

Physical Science A

Quiz: work and power

While you are waiting for the rest of your classmates to finish, please make sure that you have read the chapter.  The section two questions are due on Monday!

We will finish the muscle up lab.  Be sure to check your calculations, answer the questions at the end. 

Explain the inclined plane problem.  Show how to set up the track.  Investigate which scenario requires more work.  When finished answer the questions.

Objectives:
    1. Compare work done in different situations.  Give two examples of work being done and   
            compare the magnitude of the work in each situation. 

    2. Explain why work has a more precise scientific meaning than the meaning of work in everyday     language.

    3. Calculate the amount of work done on an object that is moved from one position to another.      Use     the formula W=Fd to solve for the work done by an object.

HW: Section two review questions, Answer the questions on both activities(muscle up and inclined plane).

Bonus Work: You can pick up the additional problems for work and power.  Also, begin working through the chapter review at the end.