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