Answer Ch.1 --- Chapter 2.1

So here was our question:

1) Hearing rattles from a snake, you make two rapid displacements of magnitude 1.8m and 2.4m. In sketches roughly to scale, show how your two displacements might add up to give a resultant of magnitude (a) 4.2m (b) 0.6m (c) 3.0m. 

And here is our answer:

Now on to Chapter 2

So the first and one of the most integral parts of physics is mechanics. The simplest form of physics is velocity and acceleration. Previously we learned about velocity through the study of vectors. 

Now acceleration and velocity of a very unique relationship. They are derivatives and integrals of each other. But before that we must know how to calculate displacement, time, and average velocity. 

A displacement is the distance or where a vector points to which are labeled as x1 and x2. So lets say we have an airplane sitting on a runway. Position 1 starts at 30 m and 0 seconds. Now lets say an airplane travels 1000 m down the runway and ends up taking the airplane 15 seconds to reach that take off point. What is our m/s?

So we take distance/time. distance is (1000m - 30m)/ our time (15s - 0s). This answer gives us 64.67 m/s. This equates to our average velocity. A very simple topic to grasp when relating to straight line motion. 

Beginning July 18th we will go over the topic of instantaneous velocity. Calculus is involved. 

Mark Jackson
Metropolitan State University of Denver