Week of September Pulley Lab

We continued with our pulley lab from last week.
This week we started off by answering the questions below: 

Simple Machines make our life easier how??

Examples of Simple Machines

Whats the trade-off?


At first I was curious why are we talking about 
Machines. Then I thought what the heck is a 
trade-off??? At first when i first heard the word trade-off I thought of the olympics...track and field with baton

Trade-off with baton

Later that day we had answered the questions in our new lab groups:

Thes questions had to do with the pulley lab we started last week. 

For the first question my group said that simple machines allow us to not 
have to do as much work. They are stronger than us and they speed up 
products/reactions. 

For the second question we said that their is 
less force more string
more force less string 


















Using the force pro we tied it onto our pulley 

Force Pro : 1:35                                  In this lab our group realized we had made a careless mistake
                                                           sad thing is we didnt notice it until we had graphed our data on a                      
                                                           bar graph.
length of string - 16inches

SAD FACE !!

This is our graphed data:

After our data was graphed we were asked: 
What pattern do you observe regarding FORCE + DISTANCE in a simple machine?

TADA. Beautiful :)! but NOT ACCURATE DATA :((

Increase in D,     Decrease in F
(trade-off)           (easier)

2d, 1/2 F 
                        = reciprocals/ inversely proportional 
4d, 1/4 F



I can relate this to real life when someone rides an elevator there is a pulley like sysetem. The ropes are attached to the elevator car, and looped around a sheave- which is just a pully with a grooves around the curcumference. The sheave grips the hoist gropes, so when you rotate the sheave, the ropes move to. The sheave is connected to an electric motor, when the motor turns one way the sheave raises the elevator, when the motor turns the other way, the sheave lowers the elevator. 

Inside Inside the elevator

The elevator itself 

Reveiw of the week

1st thing we started working on in class

Inquiry labs

This involved the manual force pro and the electronic force pro. In class we recieved a bucket with around 8 different metal atom weights in grams. We had to convert g to kg and then finding how many newts where in them.

Notes taken when doing the converting from wolframAlpha

Design Review                              

problem: Big q/query

IV: Change

DV: Measure

Constants: Keep same

QuaLitative: descriptions

QuaNtitative: number's




Post-Game Analysis:

                 (Slope)                      (Y-intercept)
y     =          m         x         +       b                              

(DV)                     (IV)

In algebra/geometry we use this exact same equation when solving for the slope intercept form.


I would say that the best activity we did was yesterday. In class we had to build this:

TADAAA!!!!!

Steps:

1. Put a string aroud 1st pully 
2. Pully hanging off of steel bar
3. Then put string around another pully
4. Then tied the 100g on the loose string
5. Then on the 2nd puly we had wrapped the second piece of string it was connected to the 1st pully
6. Hanging off the 2nd pully was the 200g
7. When it was finished you could see that both the 100g and the 200g had evened out in weight - it was so cool. 

Whenever I think of the word balance I always think about how everyone has to keep a blance in their life with academics, work, events, sleep and sports. This lab was fun to do because u would think that the 200g weight would fall having the 100g weight  but infact they balanced out.