12-4

The Physics Journalist By Lindsay Bennett December 4, 20008

Today in physics the classroom objectives were Reviewing the test that we took on 12-3, doing the daily question involving vectors, and learning about how to use vectors. We got a Unit 5B:Vectors paper at the beginning of class too. We have no homework for 12-5 either.

The daily question was to make a list of any 10 quantities like temperature, speed, and force, and categorize them either as a vector or a scalar. Vectors are directional and scalars are non directional. The list we came up with in class was **Vectors:** force, acceleration, velocity, weight, friction, displacement, and momentum. **Scalar:** temperature, mass, time, energy, power, work, speed, volume, density, length, and distance. For the time being we are just working with vectors.

We learned that we show vector by a letter with an arrow over it, Mr. Manning expects to see that from now on. It is important to remember that the vectors are only equal if they have the same direction and magnitudes. North and East are not equal.

Vectors will be drawn by an arrow, when drawing one remember to fill in the arrow head and the measurement goes to the very tip of the triangle.

We need our rulers and protractors for this unit to measure the angular measurements and the length of the vectors. They will be drawn on a graph, with 90 degrees at north and 270 and the south. East and West in the middle. It makes a complete 360 degrees once you measure the entire way around.