10/31

Happy Halloween!

Objective:  SWBAT begin to review for Wednesday's test.

Warm Up:  Pick up one handout and your graded papers.
50,000 J of work were done on a 500 kg roller coaster to bring it to a stop.  How fast was the roller coaster going when the brakes were applied?  

Reminder:  Ch 6 HW is due tomorrow 11/1.

10/28

Objective:  SWBAT calculate problems involving the Law of Conservation of Energy.

Warm Up:  Consider the old fashioned roller coaster on the board.  Calculate the gravitational potential energy at the top of each hill.

10/26

So far, we have done no work in this class.  Time to get to work!!

Objective:  SWBAT calculate the work done on or by an object, as well as experimentally determine the work and power needed to walk and run up stairwell # 3.

Warm Up:  Write a definition of the terms work and power.

Reminder-  All late work and extra credit is due today.

10/24

Objective:  SWBAT review for tomorrow's test on uniform circular motion.

Warm Up:  Pick up your graded papers. 
A  500 kg car drives over the top of a hill that has a radius of 30 m.  What is the maximum speed can the car be going without going airborne at the top of the hill?

10/20

Objective:  SWBAT review forces including centripetal force.

Warm Up:  Turn in your beanie baby lab if you haven't already.
A mass on the end of a string moving in a vertical circle.  Draw free body diagrams for the points on the circle indicated on the white board.

Ch 5 Homework due Monday!

10/19

Objective:  SWBAT experiementally determine the mass of a rubber stopper in uniform circular motion.

Warm Up:  Find two other students to work with (groups no larger than 3!), take a seat and quietly wait for Mrs. Heyes to demonstrate the proper technique for spinning your rubber stopper.

See post below for extra credit opportunity for the 1st Quarter.  It is due no later than Wed. Oct 26.

1st Quarter Extra Credit

Go to http://www.archive.org/details/ThrillDriversChoiceProjectile and view the video.

This 1956 commercial for Chevrolet shows a troupe of men driving regular Chevrolet cars, not the

“souped-up models.” They perform a variety of tricks including, at about 0:34, a jump from one ramp to

another. This is a simple projectile motion problem.  Using the video of the jump:

1)      Estimate the time of flight:

2)      Estimate the launch angle:

3)      Estimate the car’s speed:

4)      Calculate the range:

5)      Calculate y_max:

10/18

Sorry, no blog post yesterday due to the chaotic state the classroom was found in when I walked in.

In short, we took notes on uniform circular motion, centripetal acceleration and centripetal force.

Warm Up:  Pick up graded papers.  Pick up one handout.  If centripetal acceleration = v^2/r and v= 2pir/T, derrive an equation for centripetal acceleration in terms of pi, r, and T.

Closed note quiz on Beanie Baby Lab tomorrow.

10/13

No class yesterday due to PSAT testing.

Objective:  SWBAT review for tomorrow's test on forces.

Warm Up:  Turn in your Chapter 4 homework.
Pick up one review sheet.  Solve problem #1.

10/11/11

Objective:  SWBAT determine how tension acts as a force.

Warm Up:  Pick up your graded papers. 
Several students push a 15 kg block up a  3 m long ramp (25 degrees above the horizontal) with a force of 150 N.  The coefficient of kinetic friction is 0.6.  What is the normal force acting on the block?  What is the force of friction acting on the block?  What is the acceleration of the block?  If the block started at rest, what is it's velocity after it has moved 2 m?

10/7

Objecvtive:  SWBAT identify if a force problem involves equilibrium and how to solve problems when forces are or aren't in equilibrium.

Warm Up:  Get out your WS on Universal Gravitation.  Draw a free body diagram for a water skier who is bing pulled up a ramp just prior to doing a stunt jump.

Reminder:  Getting Pushy Formal Lab is due Tuesday when we get back!

10/6

Objective:  SWBAT calculate the gravitational force between any two objects.

Warm Up:  Name at least three peices of technology that you have used already today.  How do you think your morning was different from a typical moring for Steve Jobs when he was in high school?

10/5

Objective:  SWBAT draw free body diagrams.

Warm Up:  Pick up three handouts (don't staple).  What are the fundamental forces of the universe?

10/4

Objective:  SWBAT design a lab that demonstrates Newton's 2nd Law

Warm Up:  Pick up one handout.

Let's put an imaginary elephant on roller skates and give it a push.  Make a prediction as to what will happen to the accelertation of the elephant if I increase the mass of the elephant keeping the push the same.  What about if I decrease the force of the push on the elephant?

10/3

Wow, it's October already!

Warm Up:  Pick up two sheets and staple.  Find a group of no more than 3 to work with.  Pre-read the lab.  What is the force being applied to the cart?