Wednesday 2/24/21
livestream
discussed falling freely (no air, called Free Fall) and falling in air
Mechanics Exam 5
Thursday 2/25/21
continued discussing falling freely (no air, called Free Fall) and falling in air; predicted what graphs of y vs. t, vy vs. t, and ay vs. t should look like; derived v(t) by process called separation of variables
found a(t) by taking derivative of v(t)
verified that math matches graphical predictions with Desmos
students worked on Pivot Interactives: Falling Coffee Filters
Friday 2/26/21
continued discussing falling in air; found x(t) by taking integral of v(t)
verified that math matches graphical predictions with Desmos
students worked on M26 and maybe M27...both here
students worked on Pivot Interactives to investigate the relationship between R and v_term: Falling Coffee Filters
Monday 3/1/21
livestream
students worked on M28 and M29...both here
discussed results of Pivot Interactives lab (R = bv^2) and discussed finding v(t) with this new air resistance
discussed basics of the universal gravitational force: showed Youtube clip of Cavendish experiment; form of equation; universal gravitational constant, G
begun evaluating all the physics for satellite motion with uniform circular motion
Tuesday 3/2/21
livestream
continued evaluating all the physics for satellite motion with uniform circular motion
discussed concepts of gravitation to date: gravitational force, gravitational potential energy (local and universal)
watched video on gravitation, Kepler's Laws with embedded clicker questions (got to about 9 minutes in...worked Concept Tests 1 and 2)
Wednesday 3/3/21
livestream
students took quiz on air resistance
finished watching video on gravitation, Kepler's Laws with embedded clicker questions (worked Concept Tests 3,4,5, and 9)
reviewed uniform circular orbits (basics) and found connection to Kepler's 3rd Law
discussed total energy of an object in uniform circular orbit (comprised of kinetic energy and graviational energy...Etot=1/2Ug=-K)
begun discussing escape velocity
Thursday 3/4/21
finished discussing escape velocity
reviewed all gravitational concepts to date (Fg, Ug, uniform circular orbits, Keppler's Laws, gravitational acceleration)
mini-field trip outside to check out National Guard radar device
Friday 3/5/21
no livestream today - Spencer absent
watch video on escape velocity and other gravitational topics (with embedded clicker questions) (32 minutes)
watch video lecture 14 (start at beginning and watch through 13:30) with the following topics:
Escape Velocity -- The escape velocity is the minimum speed required to escape the gravitational pull. You can calculate it using the conservation of mechanical energy.
Circular Orbits -- The gravitational force provides the centripetal acceleration required for orbiting satellites. If you know the radius of a circular orbit of a satellite around the Earth, you can calculate the orbital speed and the orbital period. Examples are worked for both the shuttle and the moon around the Earth, and for the Earth around the sun. The orbital period is independent of the mass of the orbiting object.
watch video lecture 22 (with WL) discussing the following topics (start at beginning and watch through 24:14) and take notes on this video!!:
A review of equations for the period, velocity and mechanical energy of a circular orbit is given. Kepler's 3 Laws, and the planetary data that led him to his third law are introduced. The equations for elliptical orbits are discussed and compared with the equations for circular orbits. An example is worked in which all physical characteristics are determined given the initial conditions.
Take a picture of your notes from this last video and upload notes to today's Google Classroom assignment.
No Recording Today - Spencer absent
Monday 3/8/21
eLearning
no livestream today
Watch Today's Recording below for instructions for today. Basically, you will watch ALL of the AP Classroom Gravitation Videos (about 50 minutes in total) and complete a Gravitational Forces MC Quiz on AP Classroom. You will have 30 minutes from when you begin the quiz. You must complete the quiz by 11:45pm.
Tuesday 3/9/21
reviewed elliptical orbit notes
began working difficult gravitation problems
alerted students to the fact that Dynamic Study Module 5 is due tonight, DSM6 and DSM7 are due tomorrow night.
Wednesday 3/10/21
reviewed elliptical orbit notes
continued working difficult gravitation problems
alerted students to the fact that DSM6 and DSM7 are due tonight.
discussed the Formal Lab on Kepler's Laws and jump-started the data evaluation for the students ... PreLab and Lab are here . Students did pre-lab in class by using Graphical Analysis to do the repetitive calculations. Then, students plotted Mercury orbit on polar graph paper and answered questions.
Thursday 3/11/21
students conducted the Formal Lab on Kepler's Laws ... PreLab and Lab are here . Students plotted Mercury orbit on polar graph paper and answered questions.
Students worked on MasteringPhysics assignments
Friday 3/12/21
livestream - no new material to livestream
air resistance quiz retake
Students worked on MasteringPhysics assignments
Today's Recording - no recording today because students were taking a retake and then working on MasteringPhysics
Monday 3/12/21
livestream
post-lab discussion on the Mercury Lab: How did the lab demonstrate K1L, K2L, and K3L
review of rotational mechanics (Thursday retake)
introduction to new material for Simple Harmonic Motion Unit - students made predictions of graphs of F,a,v, and x (all vs. t) for a mass oscillating without friction attached to a spring (all on a horizontal surface) ... the worksheet is here ... also made predictions for mass oscillating on a vertical spring
Students worked on MasteringPhysics assignments
Today's Recording