Monday, October 25, 2010
Friday, Nov 5, 2010
Energy Cards test
Show Oaks Test Questions
URL for practice for Oaks test
Car Crash Video
Didn't have time to do the rest
Momentum and Energy with Newton's Cradle
Hewitt Energy video
Show Oaks Test Questions
URL for practice for Oaks test
Car Crash Video
Didn't have time to do the rest
Momentum and Energy with Newton's Cradle
Hewitt Energy video
Wed, Nov 3, 2010
Hand back Cookie Labs
Energy Cards - made it through presentation 1 (source - transducer - dump)
Gave out Quia website, username, password
Check out quizzes and activities
Energy Cards - made it through presentation 1 (source - transducer - dump)
Gave out Quia website, username, password
Check out quizzes and activities
Tuesday, Nov 2, 2010
Gave students time to check Cookie Lab answers with computer
Collected Roller Coaster Labs
Will collect Cookie Labs tomorrow.
Showed video The Way Things Go
Collected Roller Coaster Labs
Will collect Cookie Labs tomorrow.
Showed video The Way Things Go
Monday, Nov 1, 2010
Answered questions on Roller Coaster Lab - due tomorrow
Cookie Lab
Set up computers for students to check results.
Cookie Lab
Set up computers for students to check results.
Friday Oct 29, 2010
Review of KE, GPE, Work, heat
Conservation of Energy
Power
Roller Coaster Lab due Tuesday
Conservation of Energy
Power
Roller Coaster Lab due Tuesday
Thursday, Oct 28, 2010
Go over any questions on end of chapter questions.
Intro to energy
Feynmann Energy - Conservation of Energy
Types of energy
Work
Kinetic Energy - Energy Balls Demo
Gravitational Potential Energy
Hopper Popper Demo
Intro to energy
Feynmann Energy - Conservation of Energy
Types of energy
Work
Kinetic Energy - Energy Balls Demo
Gravitational Potential Energy
Hopper Popper Demo
Wednesday, Oct 27, 2010
Review of entire unit
Slingshot effect
Supernova demo with tennis ball and basketball
Students wrote up end of chapter questions in their journals:
1,2,4,5,6,7,8,9,
11,13,14,15,16,17,19,
20,21,22,24,25,27,28,29,
31,33,37,38
(27 in all). These will be stamped and credit awarded.
Slingshot effect
Supernova demo with tennis ball and basketball
Students wrote up end of chapter questions in their journals:
1,2,4,5,6,7,8,9,
11,13,14,15,16,17,19,
20,21,22,24,25,27,28,29,
31,33,37,38
(27 in all). These will be stamped and credit awarded.
Tues, Oct 26, 2010
Review from yesterday
Impulse, Momentum, Impulse = Change in Momentum
An apple with a weight of 1 N falls 5 m to the ground. With what force did it hit the ground?
Why do you follow through?
Cannon Example - short barrel vs long barrel
Marshmallow demo
Hewitt video on railway cars
Bouncing
Throwing and catching on ice example
Happy/Sad Ball Demo
Hewitt video on bouncing (Pelton water wheel)
Conservation of Momentum
Air track
Draw dashed lines around system
Collisions
Elastic
Inelastic
Newton's cradle
Golf ball and Bowling Ball
Impulse, Momentum, Impulse = Change in Momentum
An apple with a weight of 1 N falls 5 m to the ground. With what force did it hit the ground?
Why do you follow through?
Cannon Example - short barrel vs long barrel
Marshmallow demo
Hewitt video on railway cars
Bouncing
Throwing and catching on ice example
Happy/Sad Ball Demo
Hewitt video on bouncing (Pelton water wheel)
Conservation of Momentum
Air track
Draw dashed lines around system
Collisions
Elastic
Inelastic
Newton's cradle
Golf ball and Bowling Ball
Monday, Oct 25, 2010
Impulse and Momentum introduction
Demos: Egg toss
force plate
Showed part of Hewitt video dealing with boxing
Demos: Egg toss
force plate
Showed part of Hewitt video dealing with boxing
Monday, October 18, 2010
Monday, Oct 18, 2010
Force vs time diagram for stepping on force plate, waiting, jumping up and landing back on force plate, waiting, stepping off.
Does a jar of flies weigh more if the flies are at the bottom than if they are flying around inside? Demo with helicopter and force plate.
Coin in balloon, nut in balloon demos of inertia, friction, force of inside surface on object.
Went over end of chapter questions from Chapters 4,5,6.
Test Tomorrow.
Does a jar of flies weigh more if the flies are at the bottom than if they are flying around inside? Demo with helicopter and force plate.
Coin in balloon, nut in balloon demos of inertia, friction, force of inside surface on object.
Went over end of chapter questions from Chapters 4,5,6.
Test Tomorrow.
Sunday, October 17, 2010
Friday, Oct 15, 2010
Monday is last chance to hand in CD 5-1, CD-6-1
Coffee filter lab - write up in journal
1. Which falls faster, 1 coffee filter or 2 stacked?
2. In the absence of air resistance, which will fall faster, 1 coffee filter or 2 stacked?
3. Sketch and label a free-body diagram for both air resistance and no air resistance.
4. Sketch a graph of speed vs time for a coffee filter dropped through the air.
5. If you drop a single coffee filter from a height of 1 m, how high do you have to drop 2 stacked filters so that they hit at the same time, if dropped at the same time?
6. How many coffee filters do you need to stack so that they fall twice as fast as a single coffee filter?
7. Drop two single filters, one open and one folded. Which falls faster?
Students did lab.
Went over results in class.
Started going over questions from book at end of Chapter 6.
Did elevator examples, and lifting barbell examples using Newton's 2nd and 3rd Laws.
Test on Tuesday.
Coffee filter lab - write up in journal
1. Which falls faster, 1 coffee filter or 2 stacked?
2. In the absence of air resistance, which will fall faster, 1 coffee filter or 2 stacked?
3. Sketch and label a free-body diagram for both air resistance and no air resistance.
4. Sketch a graph of speed vs time for a coffee filter dropped through the air.
5. If you drop a single coffee filter from a height of 1 m, how high do you have to drop 2 stacked filters so that they hit at the same time, if dropped at the same time?
6. How many coffee filters do you need to stack so that they fall twice as fast as a single coffee filter?
7. Drop two single filters, one open and one folded. Which falls faster?
Students did lab.
Went over results in class.
Started going over questions from book at end of Chapter 6.
Did elevator examples, and lifting barbell examples using Newton's 2nd and 3rd Laws.
Test on Tuesday.
Thursday, Oct 14, 2010
Brain stormed physics vocabulary
Asked students to see these vocabulary words in the demos in the video.
Watched video of Physics Extravaganza.
Asked students to see these vocabulary words in the demos in the video.
Watched video of Physics Extravaganza.
Wednesday, Oct 13, 2010
Reviewed Newton's 3rd Law relating it to yesterday's demos
Forces come in "pears"
Showed parts from Independence Day.
Showed that Hollywood does not understand Newton's 3rd Law.
Forces come in "pears"
Showed parts from Independence Day.
Showed that Hollywood does not understand Newton's 3rd Law.
Tuesday, Oct 12, 2010
3rd Law lecture with lots of demos.
Inanimate objects can exert forces.
. Pull back fingers same result as leaning against a wall.
These forces are elastic, the bonds actually stretch.
. Demo with rubber band
. How does floor know how much force to exert to balance weight? Check to see if floor "stretches"
. Demo with laser pointer and mirror showing that wall actually does move when pushed.
Newton's 3rd Law Recipe
. Forces are interactions, they come in pairs
. Demo with finger in water
Newton's 3rd Law: If Object A exerts a force on Object B, then Object B exerts a force on Object A that is equal in magnitude and opposite in direction. There is NO time lag between these forces.
. Demo with force sensors. You can't pull harder on me than I pull on you
. Demo with tug-of-war. The person who wins the tug-of-war is not the person who pulls harder, it is the person who pushes harder against the floor.
. Drop apple, why does apple fall down and Earth not fall up - Newton's 2nd Law
Magic Tube Demo
. Tube pushes up on ball, ball pushes down on tube
Went over how to identify action reaction pairs of forces as opposed to forces that balance through Newton's 1st Law.
Action/Reaction forces will NEVER appear in the same free-body diagram and can NEVER cancel since they don't act on the same object.
Hand out CD 6-1 - due last time on Monday.
Inanimate objects can exert forces.
. Pull back fingers same result as leaning against a wall.
These forces are elastic, the bonds actually stretch.
. Demo with rubber band
. How does floor know how much force to exert to balance weight? Check to see if floor "stretches"
. Demo with laser pointer and mirror showing that wall actually does move when pushed.
Newton's 3rd Law Recipe
. Forces are interactions, they come in pairs
. Demo with finger in water
Newton's 3rd Law: If Object A exerts a force on Object B, then Object B exerts a force on Object A that is equal in magnitude and opposite in direction. There is NO time lag between these forces.
. Demo with force sensors. You can't pull harder on me than I pull on you
. Demo with tug-of-war. The person who wins the tug-of-war is not the person who pulls harder, it is the person who pushes harder against the floor.
. Drop apple, why does apple fall down and Earth not fall up - Newton's 2nd Law
Magic Tube Demo
. Tube pushes up on ball, ball pushes down on tube
Went over how to identify action reaction pairs of forces as opposed to forces that balance through Newton's 1st Law.
Action/Reaction forces will NEVER appear in the same free-body diagram and can NEVER cancel since they don't act on the same object.
Hand out CD 6-1 - due last time on Monday.
Monday, Oct 11, 2010
Hand back Statics Lab and go over any questions.
Finish 2nd Law video - emphasize the effect of air resistance on objects.
Modeled air resistance as knocking aside air molecules. Used hand outside car as example. The air resistance depends on two factors, the speed and the cross-sectional area. Discussed why air resistance goes up as the square of the speed (If you double the speed, you knock aside twice as many air molecules, each hitting twice as hard.)
Parachute example - same cross sectional area.
Through the air, the heavier object falls faster because it takes a greater speed to build up enough air resistance to balance the weight.
Terminal velocity occurs when the object falls fast enough so that the air resistance balances the weight.
Finish 2nd Law video - emphasize the effect of air resistance on objects.
Modeled air resistance as knocking aside air molecules. Used hand outside car as example. The air resistance depends on two factors, the speed and the cross-sectional area. Discussed why air resistance goes up as the square of the speed (If you double the speed, you knock aside twice as many air molecules, each hitting twice as hard.)
Parachute example - same cross sectional area.
Through the air, the heavier object falls faster because it takes a greater speed to build up enough air resistance to balance the weight.
Terminal velocity occurs when the object falls fast enough so that the air resistance balances the weight.
Thursday, Oct 7, 2010
Collect remaining statics labs
Start Newton's 2nd Law video
Explain why objects of different weights fall at the same rate if air resistance can be neglected. Had students explain why and used bowling ball and tennis ball if they said the forces acting on them were the same.
Start Newton's 2nd Law video
Explain why objects of different weights fall at the same rate if air resistance can be neglected. Had students explain why and used bowling ball and tennis ball if they said the forces acting on them were the same.
Wednesday, October 6, 2010
Wednesday, Oct 6, 2010
Collect RA 4.2
Statics Lab done in groups of 3
If students don't finish writeup in class, the write-up is due tomorrow.
Statics Lab done in groups of 3
If students don't finish writeup in class, the write-up is due tomorrow.
Tuesday, Oct 5, 2010
Asked students what they told their parents about the Inertia Mini-Labs.
Went over RA 4.1
Talked about inertia, mass, weight, volume, force
Newton's First Law
Showed how to draw a free-body diagram and how to find net force
Showed "breaking string" tension problem.
Handed out RA 4.2 due tomorrow.
Went over RA 4.1
Talked about inertia, mass, weight, volume, force
Newton's First Law
Showed how to draw a free-body diagram and how to find net force
Showed "breaking string" tension problem.
Handed out RA 4.2 due tomorrow.
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