Simple Machines B/Compound Machines C

Eggo · Post by **Eggo** » Tue Nov 11, 2014 9:47 am

Welcome to the Marathon for Simple Machines and Compound Machines!
Remember to hide your answers!
Note: (I thought I might as well start a question marathon for Simple Machines and Compound Machines since no one else did. )
Lets start off with: What class of a lever is the human forearm and why?

Post by **bernard** » Tue Nov 11, 2014 10:18 am

Answer (Click to Show Hidden Text)

A human forearm is a [b]Class 3[/b] lever because the load and effort are on the same side of the fulcrum, with the load farther from the fulcrum. Here are some diagrams that illustrate this: [url=http://leo.koppel.ca/backhoe/levers.png]diagram of levers[/url] and [url=http://sciencelearn.org.nz/var/sciencelearn/storage/images/contexts/sporting_edge/sci_media/bent_arm/14731-3-eng-NZ/bent_arm_full_size_landscape.jpg]diagram of arm[/url].

Eggo · Post by **Eggo** » Fri Nov 14, 2014 11:18 am

Correct! Your turn!

XturtleX · Post by **XturtleX** » Wed Nov 19, 2014 4:38 pm

A pulley has an AMA of 4, it is used to lift up a 100 N block. How much force will someone have to exert to lift it.

Userpage · Post by **Unome** » Wed Nov 19, 2014 6:00 pm

Answer (Click to Show Hidden Text)

25N

Post by **bernard** » Sun Nov 23, 2014 2:29 pm

Unome wrote:
Answer (Click to Show Hidden Text)
25N

Unome, your answer seems correct to me. Since the asker has not been on for a few days, feel free to go ahead and ask the next question.

$AMA = \frac{F_{out}}{F_{in}} \to 4 = \frac{100 \hspace{1} N}{F_{in}} \to F_{in} = 25 \hspace{1} N$

Userpage · Post by **Unome** » Sun Nov 23, 2014 2:51 pm

A 1st class lever exists with three weights. One side contains a 4.0 kilogram weight at 0.600 meters from the fulcrum, and a weight with a mass of K at 1.3 meters from the fulcrum. The other side has a 7.0 kilogram weight with a volume of 700. centimeters cubed immersed in water, at a distance of 1.0 meters from the fulcrum. Find K (Rounded to sigfigs)

ageek · Post by **ageek** » Tue Dec 02, 2014 3:25 pm

I'm not exactly sure what the "immersed in water" or the volume has on the effect, except that I can assume that it's balanced (I hope)

But here is my answer according to those assumptions (Click to Show Hidden Text)

If the kg*m is the same on either side, 7.0kg*1.0m-4.0kg*0.6m=4.6kg*m,4.6kg*m/1.3m~=3.538kg

chinesesushi · Post by **chinesesushi** » Tue Dec 02, 2014 4:50 pm

Unome wrote:
A 1st class lever exists with three weights. One side contains a 4.0 kilogram weight at 0.600 meters from the fulcrum, and a weight with a mass of K at 1.3 meters from the fulcrum. The other side has a 7.0 kilogram weight with a volume of 700. centimeters cubed immersed in water, at a distance of 1.0 meters from the fulcrum. Find K (Rounded to sigfigs)

Answer?? (Click to Show Hidden Text)

K = 3.0 kg

Userpage · Post by **Unome** » Wed Dec 03, 2014 4:16 am

Correct! Your turn.

Scioly.org

Simple Machines B/Compound Machines C

Simple Machines B/Compound Machines C

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