Homework

Calendar: A DAY Schedule (B-day schedule)

January 5th (6th) 10 minutes of content, Newton’s Laws, Hanging Up Newton’s
Laws Poster, Work on Car, Homework due Jan 7th (not in class,
can be found online:http://trillium678.wikispaces.com/homework


January 7th(8th) Homework due: grade homework together, Work on Car
(homework,pretest)

January 12th(13th) Bring on the Lamps! Car Project EVALUATION January 15th
Movie, Friction and Forces.
Friction lab with your car. (you design: inquiry)

January 19th (20th) Quiz: Newton’s Law:
Continue friction lab (scientific inquiry, CIM work sample)
Document a hypothesis before you start with the stopwatches

January 21st (22nd) Lab write up; class “visits” the rubric, (22nd)

January 26th (27th) Cumulative Final (29th)

January 28th (29th) Groups present their inquiry lab.

Snow Day Problem Set

Snow Day Problem Set:
Problems from Stair Lab

1. A 100 lb (2.12 lbs = 1kg) man climbs up the stairs slowly, it takes him 200 seconds to climb 4 meters worth of stairs.
a. How much work does he do? (show your work, use units)
b. How much power does it take?(show your work, use units)

2. A 212 lb woman climbs up the stairs quickly. She climbs the 5 meters worth of stairs in 10 seconds.
a. How much work does she do? (show your work, use units)
b. How much power does it take? (show your work, use units)

Problems from Peanut Lab
3. A 2 gram peanut was lit and heated 100g of water. The water started at 20 degrees celsius. The water ended at 40 degrees celsius. The peanut was 1.5 grams after being weighed at the end of the experiment. How many Calories were in each gram of peanut.

4. A honey roasted peanut was lit and heated .05 L of water. The water, initially 25 degrees celsius, was 100 degrees celsius (boiling!!) at the end. The honey roasted peanut weighed 3.0grams at the beginning of the experiment, and 5 minutes later, after it had cooled down, it weighed 1.2 grams. How many Calories are in a honey roasted peanut.

Peanut Lab

PEANUT LAB:
Heat the water. A calorie is the amount of work it takes to heat 1 gram (or 1 mL) of water 1 degree celsius. We will be conducting this lab:




The unit calorie has historically been used in two major alternate definitions that differ by a factor of 1000:

* The small calorie, gram calorie, or calorie (symbol: cal) is the amount of heat (energy) required to raise the temperature of one gram of water by 1 °C.

* The large calorie, kilogram calorie, kilocalorie (symbol: kcal), or Calorie (capital C) is the amount of heat (energy) needed to increase the temperature of one kg of water by 1 °C, exactly 1000 small calories, or about 4.184 kJ.


See a video explaning the lab here: http://www.youtube.com/watch?v=BhaZnQ1EpQo

Peanut lab printout

Alternative to lab printout

Stair Lab Post Lab Questions

Stair Lab Post Lab Questions
Purpose
• To determine the work and power required to climb one floor stairs.
• To determine the energy burned during that exercise

Curriculum
We examined three physical quantities: Force, Work, and Power and related units of measure. Newtons, Joules, Watts, and soon to come… calories.
One of the most important concepts in science is energy. Our universe is made of matter and energy. Matter is substance and energy moves the substance. The concept of matter is easy to comprehend, because we can see, feel, smell, or measure it. Energy, on the other hand is very abstract concept, we can’t see, feel, or smell it. But fortunately we can measure it. There are a number of units used to measure energy. A non metric unit of calorie (cal) is one of them. The energy equal to 1 calorie is defined as the amount of heat required to raise the temperature of one gram of water from 14.5oC to 15.5oC. When we work with nutritional values and food, a unit of Calories (Cal - capitol C) is used. Relation between cal and Cal is:
1 Cal = 1000 cal
Metric unit for energy is Joule (J). The energy of 1 Joule is equal to amount of heat needed to rise the temperature of 1 g of water for 1 oC. The relation between the three mentioned units is:
1 Cal = 1000 cal
1 cal = 4.19 J
1 Cal = 4190 J
When we lift the load against the earth’s gravity, work is done on the mass. The more mass on the load or the higher we lift the load, the more work is done. Every time when force is applied and something has moved because of that force, some work is done. Work is defined a as product of force and distance.
W = F d
If we lift 20 kg one story up, we perform twice as much work compared to lifting only 10 kg load, because twice as much force is needed to lift 20 kg. The unit of measurement of work is combination of unit of force N and unit of distance m: Nm which is also called Joule J.
Work can be done at various rates, or energy can be changed at various rates. In some situations happens faster in some others it happened slower. You can walk up stairs or you can run upstairs in one floor. In both cases you are doing same work but at different rates. The rate at which the energy is changed, or work is done is called Power P. P = work done/ time interval. The unit of power is: Joule/second = Watt (J/s = W)

Post Lab Questions
1.) Two people of the same mass climb the same flight of stairs. Myles climbs the stairs in 25 seconds. Ann person takes 35 seconds. Which person does the most work? Which person expends the most power? Explain your answers.
2.) A box that weighs 1000 Newtons is lifted a distance of 20.0 meters straight up by a rope and pulley system. The work is done in 10.0 seconds. What is the power developed in watts and kilowatts?
3.) A person of mass 64 kg climbs up a ladder to a height of 5.0 meters.
a.) What work does the person do?
b.) What is the increase in the gravitational potential energy of the person at this height?
c.) Where does the energy come from to cause this increase in P.E. (Potential Energy).
4. Which requires more work: lifting a 50 kg box vertically for distance of 2 m, or lifting a 25 kg box vertically for a distance of 4 meters?
Which requires more work: lifting a 50 kg box vertically for distance of 2 m, or lifting a 25 kg box vertically for a distance of 4 meters.

Momentum, Work, and Energy: Class Reading

Class Reading Assignment: http://galileoandeinstein.physics.virginia.edu/lectures/momentum.html

Force and Mass Tutorials. Read through for background

Force: Force and Mass
Force = mass x acceleration:

Force is a function of mass
Work = Force x distance

Power Output of Certain Activities

How this work applies to seatbelt physics

Topic Outline for Test

tutorials: Velocity, Acceleration, Go here for a variety of problems to download and tutorials to try http://www.physics.uoguelph.ca/~phyjlh/Prob/Problems.html

OUR CLASS TOPICS:Energy and Dynamics Outline:



Metrics: Be able to convert from metric units to other metric units

Examples:

Metric Ruler:
Kilo Hecto Deka 1 deci centi milli

101 km = _________ m .020 g = _______ mg

Scientific Notation:
Gain familiarity going from whole numbers and converting to scientific notation, and reverse.

1.3 x 10-34 = _________________________________________________

2,000,000,000,000,000,000,000 = ________________________________

Velocity: Given any two of three variables, solve for the 3rd. For example:

V = d/t t = d/v d=vt

Jenny runs across the soccer field (40 meters) to score the goal in 30 seconds. She faced and confused 4 defenders with her fast footwork. What was her velocity toward the goal?

V=
D=
T=

I bike for 2 hours My average speed was 9 km/hr. How far did I go?

V=
D=
T=

Acceleration: (change in velocity over time)

I measured my friend with a Doppler radar. He was riding his bike 15 mph and then went down a steep hill. He got to the bottom of the hill in 0.15 hours. By then he was going 30 mph on his bike! What was his acceleration.

Final velocity=
Initial velocity=
Time=
A=

Momentum
A woman walked away from Fred Meyers down interstate avenue with her cart. She had crossed Lombard avenue and hit the button for the crosswalk. She forgot about her cart for a moment and it went racing down the hill. It wrecked into a car and broke a window, crushed the side. This was a huge problem. She left a note on the car and later was sent a form from the owner’s insurance. It asked the speed of the car.

She talked to the owner of the car. He said the mechanic told him the car must have been hit with a momentum of at least 500 kgm/s. Fred Meyers carts are 20 kg. She had bought 30 kg of groceries. How fast was the cart going?

P=
M=
V=

Newton’s Laws:

1. Inertia.. an object at rest remains at rest unless disturbed by an outside force, an object in motion remains at rest unless disturbed by an outside force
2. F = ma
3. For every action there is an equal or opposite reaction

Newton’s Laws problems.
How much force do you exert on our floor?

M= Your mass: ___________ (x 1 kg/2.02lbs) = ___________________ kg


A= -9.8 meters/seconds squared


F=

Solar Car Links

Solar car made with pretty advanced tools:
(someone works at radio shack) http://www.metacafe.com/watch/1211208/a_solar_powered_toy_car_handmade/

http://dailydiy.com/2008/10/07/building-a-solar-powered-rc-car-2/

How solar cells work:http://science.nasa.gov/headlines/y2002/solarcells.htm

Scientific Notation: How to and another generator

A couple "how to" pages:

http://members.aol.com/profchm/sci_not.html
http://www.aaamath.com/dec71i-dec2sci.html (if you scroll down this one also has an interactive "try it" section that will give you immediate feedback if they are getting it right or wrong.


A page that generates questions for you to answer:
http://www.edinformatics.com/math_science/scinot6.htm

Links For Online Tutorial

OnlineTutorial:

Online tutorial link #1: http://science.widener.edu/svb/tutorial/scinotcsn7.html (If you can't get this one to work switch to this one: http://janus.astro.umd.edu/astro/scinote/ same applies, get a parent or two students to sign showing you got to 30 correct).

Online tutorial link #2: http://www.pa.uky.edu/~jeremy/courses/ast-191/applets/scientificdemo.html

Online tutorial link #3:http://www.harcourtschool.com/activity/newton/index.html

Online tutorial link #4 : For the page called Computer Lab:http://jersey.uoregon.edu/vlab/block/Block.html

Example velocity problem, speed of sound:
Speed of Sound at Patton park today is(330 m/s). The temperature change, moisture in the air, medium through which it travels, and other variables affect the speed of sound. Today, though, the speed of sound is stable at 330 m/s. If I am standing at Jeff's house 1 kilometer away. How long does it take for Brian to hear the concert start?

STEP #1

v = 330 m/s
d = 1 km time = distance/velocity or t = d/v
t =

STEP #2

v = 330 m/s
d = 1000 m
t =

STEP #3

time = 1000m/330(m/s)
t = 3.03 seconds

GraphJam

Hey all, here is a link to that page I showed you all those downloads from:

http://graphjam.com
Thanks I had a fun time singing with fourth period, y'all are the best.

Velocity Experiments

Assignments will be passed back on Monday. If you haven't finished graphing your slow flyer lab please do that and hand it to me on Monday.

Thanks!
Hope you all enjoyed campout!
Nina

Scientific Notation Tutorial

LARGE NUMBERS:
Scientific notation is a way of keeping track of very large or really small numbers.

For example, 1.23 x 10¹¹ miles can be written as 123,000,000,000. That is an example of denoting a very large number. A common use of this is writing avagadros number: 6.0221415 × 10²³ An important number in chemistry studies. It is the amount of molecules of any one substance in any gram.

Scientific notation can also assist us by eliminating the need to write so many zeros to describe a very very small number.

For example, 9.9 x 10^-10, which can be written the same as .0000000099. They are the same number. Just written differently.

Here is an explanation, http://www.nyu.edu/pages/mathmol/textbook/scinot.html

or also seen here on your assignment:

http://www.nyu.edu/pages/mathmol/textbook/scinot.html

Links on Metric Tutorials

Metric system tutorial and explanation (very clear, not much reading)

http://regentsprep.org/Regents/math/meteng/LesMetr.htm

Metric system tutorial, more explanation:

http://www.visionlearning.com/library/module_viewer.php?mid=47

Metric/English Conversions ( a list of resources):

http://regentsprep.org/Regents/math/math-topic.cfm?TopicCode=meteng