Last week we worked on problems relating to GPE and KE conservation, energy in different chemicals in food, had a very successful quiz, took notes on thermal E and the fate of the universe's energy (Thermodynamics), and started some background for a lab that we'll complete today.
Tomorrow we'll have some fun with machines - hands-on of course, before taking off for Thanksgiving!
HMWK due Tuesday:
p.165#1-7
Monday, November 25, 2013
Monday, November 18, 2013
Wed hmwk, E conservation notes, Work
HMWK due Wednesday: Read p. 154-159.
p. 156#1-3
p. 159#2-7
Today in class we practiced GPE and KE calculations with a worksheet. (keep it as notes)
Kinetic E --> thermal E was demonstrated one more time (wood on wood friction)
Some classes started notes about E types/forms and where it all goes in the end. (conservation of E)
Notes for later this week: Work
Other stuff to try out (review material)
Optional Assignment: Energy Skate Park still can be done for points; turn in by this Friday!
Tuesday we will finish notes on E types/forms and conservation/transformation (see link above), go over answers to homework turned in on Friday, and review your answers to the A+ objective #3 that I gave you as a pre-assessment at the beginning of this unit. Hopefully your answers are a bit different now!!!
We'll practice solving for velocity in a kinetic energy problem and try to apply work to kinetic energy as a warm-up. Homework is the same, plus bring in a food label by Thursday.
p. 156#1-3
p. 159#2-7
Today in class we practiced GPE and KE calculations with a worksheet. (keep it as notes)
Kinetic E --> thermal E was demonstrated one more time (wood on wood friction)
Some classes started notes about E types/forms and where it all goes in the end. (conservation of E)
Notes for later this week: Work
Other stuff to try out (review material)
Optional Assignment: Energy Skate Park still can be done for points; turn in by this Friday!
Tuesday we will finish notes on E types/forms and conservation/transformation (see link above), go over answers to homework turned in on Friday, and review your answers to the A+ objective #3 that I gave you as a pre-assessment at the beginning of this unit. Hopefully your answers are a bit different now!!!
We'll practice solving for velocity in a kinetic energy problem and try to apply work to kinetic energy as a warm-up. Homework is the same, plus bring in a food label by Thursday.
Wednesday, November 13, 2013
GPE, KE, Work. All E --> thermal E! HMWK for Friday
Monday we discussed the expected results from the Cut Short lab activity; indicated that no matter what, the pendulum had enough energy to come back to the same height (or thereabouts) that it was released from. We also started notes on Stored (potential) energy and discussed other ways of storing E.
At the end of class we got to see how well people really understood the law of conservation of energy; if they really trusted that a bowling ball pendulum would not swing back with more energy than it was given. Most people still flinched. :)
Tuesday we worked some GPE practice problems, basically solving for GPE, mass, and height, after being given other measurements about an item. (see notes link from last week) (we could also solve for g, if the problem involved a location somewhere other than Earth).
We showed that when work is done on an object, it's energy changes; the equation for work is simply:
W = change in E on an object.
Since we just learned about GPE, I showed how lifting a 2kg book from the floor to a 1-m tall table we wouldn't think about its energy, we would think about its weight (the force we have to apply to lift it) and how far it's lifted. For this book, W = m*g, so weight is 20N and we moved it 1m.
(20N*1m = 20N*m or 20J)
This spawns a new way to define work: Force * distance. (there are some qualifiers we'll learn later)
So Work = change in E OR Work = F*d
Finally we did work on paperclips... not by giving them GPE or throwing them, but bending them. The work went into the paperclip but appeared to go nowhere.. .until we felt them and they got HOT! The work went into thermal E, which is actually where all E ends up.
HMWK for Friday: p. 148#1-25 (chapter review)
Wednesday, we used ramps and cars to calculate both GPE at the top of the ramp and the work done in pulling the car up the ramp.
(GPE = m*g*h) and Work = change in E OR Work = F*d
After all was said and done, the GPE calculations were very similar to the Work calculations!
This showed that they were the same; work done on an object is equal to its change in energy. Sometimes the energy is hard to see (Thermal) but the amount is the same; energy is conserved... Energy is used to do work, and work involves a change in energy.
This concept will be used in several other applications.
Thursday we'll start off with a video about the Physics of Car Crashes - I really like it - and at the end of class we can demonstrate the work - GPE relationship and tie it into KE. Then I'll show you how it relates to Force, acceleration, change in velocity, etc... and then many of you will be happy to see that you finally "get" many of the motion and acceleration problems from the beginning of the year.
At the end of class we got to see how well people really understood the law of conservation of energy; if they really trusted that a bowling ball pendulum would not swing back with more energy than it was given. Most people still flinched. :)
Tuesday we worked some GPE practice problems, basically solving for GPE, mass, and height, after being given other measurements about an item. (see notes link from last week) (we could also solve for g, if the problem involved a location somewhere other than Earth).
We showed that when work is done on an object, it's energy changes; the equation for work is simply:
W = change in E on an object.
Since we just learned about GPE, I showed how lifting a 2kg book from the floor to a 1-m tall table we wouldn't think about its energy, we would think about its weight (the force we have to apply to lift it) and how far it's lifted. For this book, W = m*g, so weight is 20N and we moved it 1m.
(20N*1m = 20N*m or 20J)
This spawns a new way to define work: Force * distance. (there are some qualifiers we'll learn later)
So Work = change in E OR Work = F*d
Finally we did work on paperclips... not by giving them GPE or throwing them, but bending them. The work went into the paperclip but appeared to go nowhere.. .until we felt them and they got HOT! The work went into thermal E, which is actually where all E ends up.
HMWK for Friday: p. 148#1-25 (chapter review)
Wednesday, we used ramps and cars to calculate both GPE at the top of the ramp and the work done in pulling the car up the ramp.
(GPE = m*g*h) and Work = change in E OR Work = F*d
After all was said and done, the GPE calculations were very similar to the Work calculations!
This showed that they were the same; work done on an object is equal to its change in energy. Sometimes the energy is hard to see (Thermal) but the amount is the same; energy is conserved... Energy is used to do work, and work involves a change in energy.
This concept will be used in several other applications.
Thursday we'll start off with a video about the Physics of Car Crashes - I really like it - and at the end of class we can demonstrate the work - GPE relationship and tie it into KE. Then I'll show you how it relates to Force, acceleration, change in velocity, etc... and then many of you will be happy to see that you finally "get" many of the motion and acceleration problems from the beginning of the year.
Thursday, November 7, 2013
Thursday: HMWK for tuesday, Quiz Friday!
HMWK due Tuesday: Read p. 135-143; p. 143#1-6
Quiz Friday. Topics: Newton's 3rd law, conservation of momentum, and Gravitational Potential Energy
Today in class: Finish graph matching activity (picking out which roller coasters matched which graphs), cut short pendulum lab, and answers to hmwk.
Tomorrow after our quiz we'll take some notes on energy and attempt to repeat Galileo's energy experiment.
Quiz Friday. Topics: Newton's 3rd law, conservation of momentum, and Gravitational Potential Energy
Today in class: Finish graph matching activity (picking out which roller coasters matched which graphs), cut short pendulum lab, and answers to hmwk.
Tomorrow after our quiz we'll take some notes on energy and attempt to repeat Galileo's energy experiment.
Tuesday, November 5, 2013
Egg Drop Tuesday! HMWK for Thurs., Optional Assignment
Tuesday we will compete to construct the best way to safely change the momentum of a falling egg. Remember, this can be done with a force acting over a time, so momentum = force * time OR mass * velocity.
HMWK for Thursday: Read p. 128-133; p. 133#1-7
Optional Assignment: Energy Skate Park
Due by 11/19
Wednesday: conservation of momentum demonstrations:
elastic vs. inelastic balls - which transfers more momentum, multiple ball collision and momentum conservation, Newton's 3rd / momentum rocket.
Review/reteach: Ball on string
Graph matching activity
Notes: Energy (if time)
A+ Objective 3 pre-assessment
Thursday: Cut Short Pendulum Lab
HMWK for Thursday: Read p. 128-133; p. 133#1-7
Optional Assignment: Energy Skate Park
Due by 11/19
Wednesday: conservation of momentum demonstrations:
elastic vs. inelastic balls - which transfers more momentum, multiple ball collision and momentum conservation, Newton's 3rd / momentum rocket.
Review/reteach: Ball on string
Graph matching activity
Notes: Energy (if time)
A+ Objective 3 pre-assessment
Thursday: Cut Short Pendulum Lab
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