Next week there are no classes on Monday but Tuesday follows Monday's schedule. HOWEVER, I cannot be there for lecture
time on Tuesday. We will have recitations as usual, but it's extra essential that you come since I will probably use the
Average Velocity, Instantaneous Velocity, Displacement, and Velocity-Time Graphs
So far, weve examined how knowing the position of an object as a function of time, ~r(t) allows us to compute the average
velocity over a given time interval, and also ho
CAPA Access Page is up and running. The first time you go, you can just enter the e-mail address you registered and you
will receive an e-mail with your CAPA access code. You can then fill in the rest of the boxes with the code and the se
Concepts and Models
In order to describe motion we have developed a vocabulary consisting of a set of core concepts and related definitions:
Frame of Reference: A specific perspective, combined with a choice of coordinates that allows
Announcements: various changes have been made to the course schedule including postponement of the first minitest. Ill be
extending the first and second homework set due dates. Please make sure to look at the schedule (ignore the bottom for now, I
Completed topic area 1 (Kinematics) last time. Minitest 1 on Wednesday will only involve topic 1.
Today we begin a topic area 2: Momentum.
Up until now we have developed the conceptual and mathematical tools for describing the motion of objec
Reminder: Minitest 2 next week on Friday
Do the reading listed in the course schedule! In particular, I highly recommend supplementing these energy lectures by
reading chapter 5.
Three types of collision processes, charact
Collisions and Kinetic Energy
Weve discussed a few different kinds of interactions in the form of collisions so far in this class. Id like you to think about how
you could solve the following problem:
Two identical carts collide with each ot
Pick up your testsparticularly your scantrons. If you filled it all out correctly and had no trouble with grades, please try
to reuse them.
The next minitest starts with question number 4!
Minitest 2 is on Friday. Bring a calculator,
Minitests should be graded by early next week.
Homeworks 1 and 2 will not be extended beyond this weekend!
Homework 3 will be ready during the weekend. Ill put up a Piazza announcement when it is done. Dont start working
on it now sin
Read Mazur Chapter 7 for next week.
The state of a system is a description of the system in terms of a complete set of physical parameters or variables. Consider
the following systems and think about how youd describe th
Minitest 1 on Wednesday
Topic areas: Kinematics
Key concepts: Position, Velocity, Acceleration, and their relationships. Sub-concepts like distance, displacement,
Multiple choice in the style of the homeworksmultiple
Momentum of a System Activity
Are Inertia and Momentum Extensive?
Consider a cart moving with velocity ~v . Is the velocity an extensive property of the cart?
Answer: No it isn't. Imagine dividing the cart up into two halves. Both halves travel with the s
Weve seen that systems have an extensive property called energy and that it consists of two pieces: kinetic energy K and
internal energy Eint .
Kinetic energy is associated with the motion of parts of the system
Motion in One-Dimension Kinematics in 1D
1.1 Representing Motion
Displacement is change in position during a time interval. When the x-component of position changes during a
given time interval (i.e. the objects x-coordinate changes) we call that
Describing Motion in One Dimension (Kinematics in 1D)
We see things moving all around us, but we rarely pay close attention and really observe motion. Similarly, we use various words
to describe aspects of location and motion, bu