Wave interference and boundary behavior

Here is a link to a tutorial on wave boundary behavior.  Read the content and watch  the video with the following in mind:

When do waves invert?

What happens to speed of the wave in different medias for reflected, transmitted and incident waves?

Biochar Sales Assignment

Biochar Sales Assignment.  Due date Wednesday  30 points

Design a one page 8.5”  X 11” advertisement for selling biochar online.   The advertisement should communicate your understanding of how biochar works  as well as your understanding of the competitive nature of the market.

The advertisement should include:

1.     Interesting name for your product  and Buy It Now Price

2.     Colorful original graphic.  You may not use graphics that you did not create

3.     Description of product to include:

weight and/ or  volume

size of char particles

picture of char particles

how char was made  (ex high temp pyrolysis of hard wood pellets)

Country of product origin of product

4.     Instructions for using the char  (example—how to inoculate with compost, how to charge with either compost tea or other high nitrogen sources, and how to mix with soil, either in pots or in ground

5.      Explain method of biochar action ---ie symbiosis with mycorrhiza, plants and nitrogen fixing bacteria, as well as the fact that the biochar is a general nutrient sponge for NPK, so less fertilizer runs off

6.     Print out the one page label with the graphic.   This does not have to include all of the information   but should at least include the essentials.      The total information can be more than one page if required.  

Fluids Test Overview for Monday

Here is an outline of what will be on Monday's Fluids Test

1.  Be able to predict and explain why floating objects would float higher in a dense fluid like alt water than in a less dense fluid like fresh water.  Think forces.

2.  Calculate a buoyant force given the weight in air and in water  and then be able to calculate the density of the object.  Understand that if it has an apparent weight in water it has sunk.

3.    Calculate the buoyant force in water of a floating object given only its mass in air

4.  Calculate buoyant force of a sunken in water cube given dimensions

5.  Find the density of a rock in kg/ cubic meter given mass and volume in cubic centimeters

6.  Find volume of a helium balloon needed to lift a given payload when mass of balloon skin, payload, density of air and helium and air are given .  This involves algebra solving for volume

7.  Find pressure on a chair leg given mass and contact radius  of one leg

8.  Calculate total or absolute pressure at a given depth in water.  From their calculate gauge pressure.

9.  Solve for velocity of fluid in a pipe given diameter at both ends and speed at one end

10  Explain lift over an aerodynamic structure like a sail or a wing in terms of fluid velocity, pressure and force.

Study Guide for Momentum and Impulse test Chap 6

Here is a list of topics for the Chap 6 Test

1.  calculate linear momentum given m and v  and understand that negative veloccity defines opposite direction  P = mv

2.   Understand the Impulse momentum equation   M delta V = f delta T  Impulse is f de;ta t measured in Nxsec  and change in momentum is measured in Kg X m / sec  Be able to calculate any one quantity given the three

3.  Calculate stopping distance  as in Sample problem C pg 202 text  You must remember the four equations of motion

4.  Know the equations  for conservation of Momentum and kinetic energy

5.  Know the difference between an elastic and inelastic collision and what is conserved in each type


6.  Solve for a final velocity in an inelastic collision  (practice E pg 214)

7.  Solve for a final velocity in an elastic collision  (sample G pg 218)

8.  Be able to calculate the change in KE for a collision and interpret results.  Ex if delta KE = O, then KE was conserved and this was perfectly elastic.  If KE is not zero, energy was lost as nonmechanical energy like heat, sound.

Mouse Trap Vehicle Project Description and Rubric

Project Description:

This is a performance based assessment, meaning you are graded largely on how your project performs not on the number of hours you worked on it.  There are no partners and no teams.  Students will use one Victor brand mouse trap as the energy source to drive a vehicle as far as possible down the hallway.  They will get a maximum of three tries to produce their best distance and that distance will be the basis for their grade.  You must test your vehicle before the due date to ensure it works.     The use of a project from another student from a current or past competition will be treated as any other case of academic dishonesty and will result  in the grade of "Zero" on the project.

You may use any materials you wish as long as those materials do not add energy to the vehicle.  For example rubber bands or springs or rockets that store elastic energy are forbidden.  However, no kits are allowed.  The use of a kit will result in a 30 point reduction in score.  A 90 would become a 60.

Note:   All designs must have at least three wheels.  Two wheel designs have been too unpredictable to be considered for this project.  

Due Dates:        First:   The first lab  period in the Week beginning Monday, Jan 6 after  Winter Break.

                       Second:   First lab Period in the Week beginning Monday, Jan 13

Point value:  50  points for the first test output  and 50 points for the second test output., with other point values assigned also.   Example 5 points for drawing and materials list.

Grade Scale for mouse trap project

D = 10-12.99 meters

D+ = 13-14.99 meters

C- = 15-16.99 meters

C = 17-18.99 meters

C+ = 19-20.99 meters

B- = 21- 23.99meters

B= 24- 27.99 meters

B+ = 28-29.99 meters

A- = 30 -32.99meters

A = 33-34.99 meters

A+ beyond 35 meters

CP Physics Energy Test Study Guide

Here are the list of topics to study for the CP Physics Energy Test on Friday

1.  knowing when work is done and when it is not done

2.  Calculating work and knowing the units of work

3.  Calculating Gravitational Potential Energy

4.  Calculating work when displacement is at an angle other than 90 degrees to Force

5.  work when displacement and force are at 90 degrees to each other

6.  Sign of work when force and displacement are 180 degrees apart

7.  Work accomplished when carrying something across a room

8.  Calculating Kinetic Energy given mass and velocity

9.  Calculating velocity given KE and mass

10.  Kinetic Energy Work Theorem,  solving for an unknown like final velocity  given initial velocity, force and distance

13.  solving for v when setting KE equal to GPE

14.  Calculating elastic potential energy

15.  setting one form of energy like kinetic equal to potential and solving for one variable like "v"

16.  Hooke's Law problem for a spring, solving for "k"

17.  Calculating power given work and time or given force and velocity

18.  Units of power including horsepower, watts, kilowatts, joules/sec

19.  definition of power

AP Physics Rotational Motion Test

Here are the topics covered for the test:

7.4 centripetal acceleration
7.5 Newtonian Gravitation
7.6 Kepler's Laws
8.1 Torque
8.2 Torque and equilibrium
13.4  Position, velocity, acceleration (Mass Spring stuff)
13.5  motion of a pendulum