10/22

Objective:  SWBAT relate force with the motion of an object.

Warm Up:  Get out your netbook,open edmodo, and start the sim.

Note that the you will be using two different sims for this assignment- Moving Man, and Forces and Motion.  To get to the sims within the pHet site, click on Physics on the far left column.  The Physics sims are listed in alphabetical order.

9/25

Objective:  SWBAT explore vectors using a riverboat simulation

Warm Up:  Get out your netbook, log on to edmodo and complete the river boat sim posted in edmodo.  Copy and paste the questions into a word doc, answer the questions and resubmit to me as a post in edmodo.

9/20

Objective:  SWBAT manipulate unit vectors including addition, cross products and dot products.

Warm UP:  Today is a work day.  Finish your sim, or take notes from the power point, or work on the problems assigned.  NO food or drink around the netbooks.

9/19

Objective :  SWBAT review the basics of projectile motion.

Warm Up:  Get out your netbook and log into edmodo (unless your netbook number is listed on the board).  If your netbook number is listed on the board then it won't run the sim because it doesn't have Flash installed.  Use one of the regular student computers instead, until we fix the Flash problem.  Complete the U of Colorado (PHeT) sim activity.  NO FOOD OR DRINKS MAY BE OUT WHEN YOU ARE USING THE NETBOOKS.

Note:  The average on the M.C. section of the test was 73%.  It is obvious from the grades that you either knew the material or you didn't.   I have not graded the FRQ yet.

9/17

Objective:  SWBAT review for tomorrow's test.

Warm Up:  Get out your Example Problem packet.  Do number 3.

9/11

Yesterday we did a lab to determine d, v and a of a cart given a constant acceleration from a fan.

Today we worked in small groups learning how to differentiate simple equations using some calculus short cuts.

9/5

Objective :  SWBAT review the basics of kinematics.

Warm Up:  What are the 4 basic kinematic equations that we used last year (not the one that define d, v, and a)?

8/28

Objective:  SWBAT determine the value of g in the classroom using two different methods.

Warm Up:  Pick up a lab packet and preread the introduction, equipment, and experimental procedures.

8/28

Objective:  SWBAT take a quiz on the AP summer assignment.

Warm Up:  List some causes of error when you take measurements.  Then come up with ways to minimize them.

8/27

Objective:  SWBAT understand how to estimate answers and how to write a formal lab writeup

Warm Up:  Pick up one handout.  How many breathes would the average dog take in its lifetime?

8/24

Objective:  SWBAT review measurements and error.

Warm Up:  Pick up two handouts.  How are absolute and relative error related?

8/23

Objective: SWBAT understand the importance of units, dimensional analysis and estimating error in science.

Warm Up: Pick up one handout, one safety test, and your scantron. On a separate sheet of paper copy the questions you got wrong AND give the correct answer AND the reason for the correct answer. Staple your corrections to your scantron.

If your scantron is not there, please see me.

8/21

Objective: SWBAT review safety procedures in the lab and take the safety test.

Warm Up: Place signed papers in separate piles on the back table in the class.

Find a partner and determine one thing that you should NOT do in a science class during a lab.

8/21

Welcome back to another school year!

Objective:  SWBAT familiarize themselves with the AP Physics C course, what we will be learning this year, and what is expected of them this year.

Warm Up:  Pick up 9 handouts.  (Yes, 9 handouts!!) Have a seat where you will learn best.

Quiz: http://www.polleverywhere.com/my/polls#!/my/polls  (really it's just a poll so don't panic)

Homework: 
1)  Fill out your paperwork, get parent signatures, and turn in tomorrow.
2)  Log on to Edmodo (www.edmodo.com), create an account if you don't already have one and do the short assignment.
3)  Read the safety contract.  Tomorrow you will take the Safety test.

5/1

Objective:  SWBAT determine the forces on an object in equilibrium.


Warm Up: Draw a free body diagram of the top pulley in this picture.

4/26

A 10.0 kg box is pushed from the top of an incline and travels down the incline with an initial speed of 5.00 m/s.  The incline is 4.00 m long and the angle of the incline is 37.0 degrees.  The coefficient of friction between the box and the incline is 0.400.  Determine the a) loss of potential energy and b) work done by friction.  c) Use the work-energy theorem to determine the velocity of the box at the bottom of the incline.

4/25

Objective:  SWBAT determine the limit that defines the terminal velocity of an object that encounters velocity dependent resistive forces.


Warm Up:  You are 1000 m high in an air balloon and you drop your physics book overboard.  Sketch the d vs t, v vs t and a vs t graphs for the book (assume that at some point it reaches terminal velocity).

4/24

Objective:  SWBAT determine the force on an object (Review of Forces)


Warm Up:  A 2 kg mass is pushed 0.5 m into a spring with spring constant 200 N/m on a frictionless horizontal surface.  Upon release, the mass travel across the surface until it encounters a rough incline.  The mass moves up the incline and stops at a height of 1 m above the horizontal surface.
a.  How much work must be done to compress the spring initially?
b.  What is the speed of the mass at the base of the incline.
c.  How much work was done by friction on the incline?

Physics: Retarding and Drag Forces

4/20

Objective:  SWBAT calculate projectile motion.

Warm Up:  Pick up a half sheet of paper.  Place your answer to the warm up on the paper.  You must do your own work. You have 4 minutes.


A projectile is fired with an intial speed of 113 m/s at an angle of 60 degrees above the horizontal from the top of a cliff 49 m high.  Determine the time to reach maximum height and the total time of flight.

3/29

Objective:  SWBAT understand Keplers Laws and their applications.


Warm Up:  How far from the earth's surface must a satellite in space be if it is to feel a gravitational acceleration that is 1/8th what it would feel if it were still on earth?

3/22

Objective:  SWBAT review for Monday's test on SHM and oscillations.


Warm Up:  Get out your review packet.  In the equation x=0.25 cos (8 pi ) t, what do 0.25 and 8 pi represent?

3/22

Objective:  SWBAT mathematically describe the oscillations of an object in SHM.


Warm Up:  A car with a mass of 1300 kg is constructed so that its frame is supported by four springs.  Each spring has a force constant of 20000 N/m.  If two people riding in the car have a combined mass of 160 kg, find the frequency of vibration of the car after it is driven over a pothole in the road.  How long does it take the car to complete two vibrations?

3/21

Objective:  SWBAT calculate simple harmonic motion


Warm Up:  Pick up one handout.  Make the questions you will be answering as follows: 6,7,8,9,11,12,13,14,15,19.

3/13

Objective:  SWBAT calculate the period of a simple harmonic oscillator.


Warm Up:  A block of mass m if allowed to hang from a spring in static equilibrium.  It stretches the spring a distance L.  The block and spring are then set into oscillation.  Is the period of this system less than, equal to or greater than the period of a simple pendulum having a length L and a bob mass m?

3/8

Objective:  SWBAT determine the coefficient of friction needed between and ladder and the floor to keep the ladder from slipping.


Warm Up:  Get back with your partner from yesterday.  Draw a free body diagram for the ladder in the handout.

3/7

Objective:  SWBAT calculate the force on a human ankle.


Warm UP:  Pick up a field trip permission slip and 1 handout.  Read the handout and write down the steps you would need to take to solve this very complex problem.

3/5

Objective:  SWBAT calculate static equilibrium problems.


Warm Up:  Turn in your outline for Ch 12 and pick up one syllabus for the chapter.
What are the two necessary conditions for static equilibrium?  How is this different than the conditions necessary for rotational equilibrium?

2/27

Objective:  SWBAT calculate the rotational momentum of an object.


Warm Up:  Define precessional motion.

2/23

Back to Blogging.  Sorry but there were some technical errors the last few days......


Objective:  SWBAT calculate angular momentum both with and without translational motion.


Warm Up:  Pick up 3 sheets and staple.  Complete problem number one.

2/14

Hey, for Valentine's Day, take the day off.  It's my gift to you ;-)

But if you are bored (and finished with your Rotational Motion problems) check out the physics of flying cupid pigs in Angry Birds.  http://www.wired.com/wiredscience/2011/02/angry-birds-and-the-valentines-pendulum/

2/13

Objective:  SWBAT review angular kinematics. moment of inertia and torque.

Warm Up:  Turn in lab and homework.  Pick up 3 papers and staple.  Answer #1.

2/9

Objective:  SWBAT determine the rotational equilibrium of a ruler under several different circumstances.

Warm Up:  How do you calculate torque?  How is the torque on a rotating object related to Newton's 2nd Law?

2/8

For the last three days we have be slogging through rotational kinematics and moments of inertia.  I have uploaded the power point presentation and it can be found to the right of the blog below the important links.

This chapter and the following chapter (Ch 10 and 11) are probably the hardest material we are going to cover this whole year because the number of types of motion that can occur within a single problem is increasing.  It is imperitive that you quickly learn all of the new rotational variables that now we have, what their relationships are to each other, and their analogous variables in translational motion.

These two chapters also are the most Calculus intensive.  For Calc I students, if you are struggling with the Integrals, just remember that the AP test isn't until May, so you'll have lots more time in this class and in Calculus to practice Integrals.  For Calc II students, this should be a matter of applying what you have already learned in Calculus to the Physics concepts.

Hang in there!  After this we only have two more topics to cover.

2/2

Objective:  SWBAT review for tomorrow's test.

Warm Up:  Get out your review packet. 

1/31

Objective:  SWBAT review for Friday's test.  (Yes it's Friday, not Thursday.)

Warm Up:  Labs turned in or emailed?
A block of mass 1.6 kg is moving to the right with a speed of 4.0 m/s on a frictionless track when it collides with a second block of mass 2.0 kg, attached to a spring.  The second block is moving to the left at a speed of 2.5 m/s.  The spring's constant is 600 N/m.  At the instant the first block is moving with a speed of 3.0 m/s to the right, determine the velocity of block 2.

1/30

Objective:  SWBAT begin to review linear momentum.

Warm Up:  Pick up one review packet.  Answer Question # 1.

Did you turn in your hover puck results and your momentum virtual lab? 

1/27

Yesterday we collided hoover pucks together and recorded the collisions with the flip cameras.

Today you will analyze the recordings to determine if the momentum was conserved in a 2-D collision.

What you will turn in to me is your calculation of the initial momentum of the moving puck, the calculations of the final momenta of both pucks and an error analysis showing percent difference.

1/25

Objective:  Solve momentum problems in one and two dimensions.

Warm Up:  A 0.5 kg object traveling 5 m/s to the right along the x -axis strikes (in an elastic collision) a 0.75 kg object that is stationary sitting ever so slightly above the x axis.  The first object moves off immediately afterward at 3 m/s at an angle of 30 degrees below the x axis.  What is the speed and direction of the other object immediately after the collision?

1/23

Objective:  SWBAT virtually determine the change of momentum of a cart on an air track

Warm Up:  Split up into groups of 3 and go to

http://electron9.phys.utk.edu/phys135d/laboratories/Lab7.htm .  Read the directions and watch the first video (it is only a few seconds long).

1/20

Yesterday we worked on center of mass.  Today we will visit momentum.

Objective:  SWBAT understand the conservation of linear momentum.

Warm Up: What is the x coordinate of the center of mass of yesterday's right triangle?

1/11

Data Studio Software is still not working on the computer system, so we will finish the Conservation of Energy lab next week.

Objective:  SWBAT review for tomorrow's test.

Warm Up:  Get out your test review packet.  Pick up two handouts.
A 5 g particle traveling 2 m/s to the left collides with a 10 g particle that is at rest.  They stick together and move off at what velocity?

1/4

Objective:  SWBAT understand the relationship between potential energy and work done on or by a system.

Warm Up:  What is the difference between a conservative force and a nonconservative force?