Electric Circuits

Hello all! I am your scribe for today.

So we had a substitute in today for Ms. K who gave us a few sheets to work on for the class. All of which were about electric circuits. The sub was pretty helpful and not only helped us with using our units and types of circuits but also gave us quite the inspirational speech on being persistent in learning physics.

That's really all that happened today, so I thought I'd include some hyperlinks to some websites that discuss electric circuits that may help anyone who is having trouble with the concepts....

Tomorrow's Scribe will be Nicole!!

http://www.math.ucdavis.edu/~daddel/linear_algebra_appl/Applications/Electrical_Circuits/Electrical_Circuits.html

http://www.hyperstaffs.info/work/physics/child/index.html

Hooke's Law

Today in Physics class....

FIRST

We went over the questions in the duck book (MS. K has posted the answers below).

SECOND

We learned about Hooke's law of elasticity which is "an approximation that states that the amount by which a material body is deformed (the strain) is linearly related to the force causing the deformation (the stress)."

Note the following equations:

Hooke's Law

F=kx

Spring Potential Energy

Es=1/2kx²

Gravitational Potential Energy

Ep=mgh

THIRD

We were given a lab that was related to Hooke's law. There are questions included in this lab and it will be due tomorrow although we are supposed to be getting some time to work on it tomorrow as well.

The equations you see above should come in handy if you're trying out the questions for the lab.

Sorry this isn't the most extensive post, but I've got work soon and I still need to work on my lab.

Tomorrow's Scribe will be....

DINO

Dynamics//Equilibrium

Hello hello everyone, this is Kim and I'll be doing our little scribe post for today.

Today we got a handout that went over our dynamics unit. It defined equilibrium (an object is in equilibrium when it has zero acceleration) and it also took us through a reasoning strategy for analyzing equilibrium situations. The steps are as follows:

1. Select the object to be studied.


2. Draw a "free-body diagram."


3. Choose a set of x and y axes.


4. Set up equations so that the sums of the x and y axes are zero.


5. Solve the equations for the unknown quantities.

These five steps should be utilized when solving equilibrium problems in 2D (the more complicated ones).

In the case below (1D) the problem is made much simpler because all you need to solve the problem is the mass of the object. Using the mass, you can plug it into the formula, F=mg. g=-9.81 and multiplying this force of gravity to the mass you will find the downwards force (F).
Once you discover the value, it's simply a matter of realizing that the downwards force you already solved for is equal and opposite to the upwards force.
Thus, the values for each of the 2 cables holding the sign (T) are simply half of the upwards force.


**Note: Ms. K gave us all an assignment on static equilibrium that will be due tomorrow!

Personally, with plenty of help and explanations, I'm slowly understanding all of the concepts we're dealing with and the best thing to do if you don't understand is to simply ask questions. Ask Ms. K, your classmates or anyone who can help you.

Have a good night everyone and don't forget your assignments since it is for marks.