Should Have Had a Snowday Day

On this wonderful, should-have-been-a-snowday, we white boarded the "Review Sheet" packet and managed to get through page 1 and 2. Seeing as this is a review packet, it is assumed that we already know this material thoroughly, so I will generally highlight the important points that will be important to remember for PART ONE of the test tomorrow.



-Unbalanced forces always lead to acceleration.



-Acceleration only occurs in the instant of the hit (see the bowling ball problem on page 2).



-Arrows can be added together ONLY if they have the same units. That is to say, do not EVER try to add together an arrow is in Newtons with an arrow in meters/second. Again, this point stems from the bowling ball problem on page 2.



-Newton's 3rd Law Force pairs must be the same type of force (like gravity) AND the agent-object is switched in the FBD's. An example of this would be:

Fg,earth-person

Fg,person-earth

-And yes, that too is another key point. You, as a person, are enacting a force of gravity on the earth just as the earth is enacting gravity on you, because gravity is a two-way street.

Also, because I promised it would appear in my Blogspot:

-BIRD IS THE WORD-

If you are having any trouble understanding concepts, I would find the Physics videos that Mr.Dickie has made; these can be found via Edline. They offer a straight-forward explanation of concepts, such as how to correctly use vector addition and component vectors.

Keep in mind that tomorrow, Friday, February 4, is the first part of a 2 part test; the second part is to be followed up on Monday.