Fwd: 2/19 HS Physics update and homework due 2/26

Hi folks,
This week we dove a bit deeper into the concept of energy and work by taking a look at simple machines.  We did a lab were we observed the relationship between force, distance and work as it applies to pulleys.  

By the way, there WILL be a quiz next week.  It's been awhile so I'll give you some tips as to what to study for.  Definition of energy, PE and KE, that wacky roller coaster problem, definition of work etc.  Don't worry about this pulley, simple machine stuff yet.  It will be on an upcoming quiz but not this next one.

For homework this week,
Read this website, starting on the introduction page and finishing on the terminology page (just keep clicking through).


These question refer to the reading or the lecture.

1. What is the definition of a simple machine?

2. What are 4 things simple machines do?  (Looking for the list on the second page of the website.)

3. What are 5 features of a simple machine?

4.  Name 6 simple machines.  Give me an example of each one.

5.  What is meant by the term "mechanical advantage"?

6.  When is the mechanical advantage of a slope greater?

7.  When is the mechanical advantage of a wedge greater?

8. When is the mechanical advantage of a screw greater?

9.  When is the mechanical advantage greatest for each of the 3 classes of levers?

10.  How would you describe the pulley set ups you used in the lab using the definitions from this website?

11.  What meant by "load" when it comes to simple machines?

12.  What is meant by my statement "simple machines do a flippy floppy when it comes to force and distance?

13.  Do simple machines change the amount of work it takes to do a job?   (Feel free to use capital letters and exclamation points here.)

14.  With today's pulley lab, where was the effort force?

15.  With today's pulley lab, where was the load force?

16.  With today's pulley lab, what was the load?

17.  When you added pulleys, was there more or less force needed to lift the load?