Physics I Honors
Chapter 5
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Green: Due/Test
Red: Homework
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Updated 12.10.2009
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- 5th
- Extra credit presentation
- Energy is the ability for something to cause any change in itself or its environment
- Forms of energy:
- Heat, sound, vibration, translation, rotation, kinetic, potential (spring, gravitational, chemical), nuclear, electrical/magnetic, etc.
- Law of Conservation of Energy - Energy cannot be created nor destroyed - only transformed in a change process
- What forms of energy does the food we eat change into?
- What forms of energy does the gasoline we put into cars change into?
- DiscoveryRide energy worksheet download a copy
- Chemical potential energy and metabolism
- 6th/7th
- Energy is the ability for something to cause any change in itself or its environment
- Kinetic energy
- Intro. to Power Lab
- *Power Lab
- Show the beginning of Gossamer Condor
Wednesday, November 25
- 5th/6th
- Continue Discovery Ride energy worksheet
- Gravitational Potential Energy
- Work
- W=Fd; Work's unit is joule [J] Read about James Prescott Joule's honeymoon adventures
- Work/Energy theorem (W=deltaK)
- Work is only done if the force is applied for a distance!
- If there is no distance then no work is done
- How much work is done pushing a book down on a desk? none
- How much work is done sliding a book along a desk? W=Fd=frictional force times the distance. frictional force is equal to mu times the normal force
- How much work is done holding a book in a stationary position? none - no distance change
- How much work is done carrying a book up stairs? W=Fd=weight of the book times the height of the stairs. no work is done in the horizontal direction because no force is applied horizontally
- How can you do more work by carrying books up stairs?
- Power
- Kinetic energy
- Intro. to Power Lab download a copy
- *Power Lab
- 7th – Lots of students out to sing for choir
- Finish Gossamer Condor
- Gossamer Albatross and Helios information. The prize is worth about $340,000 today
Thursday, November 26 to Monday, November 30
Tuesday, December 1
- 5th:
- Power Lab due
- If there is no distance then no work is done
- How much work is done pushing a book down on a desk? none
- How much work is done sliding a book along a desk? W=Fd=frictional force times the distance. frictional force is equal to mu times the normal force
- How much work is done holding a book in a stationary position? none - no distance change
- How much work is done carrying a book up stairs? W=Fd=weight of the book times the height of the stairs. no work is done in the horizontal direction because no force is applied horizontally
- How can you do more work by carrying books up stairs?
- Examples:
- How much work is done lifting a 35 kg concrete block a height of 0.85?
- How much work is done moving the block down a hallway 13 m at constant speed?
- You pull a 42 kg boy on a sled with a rope that makes a 32° angle with the ground. The pull forc is 52 N. How much work is done in moving the boy a distance of 220 m?
- Kinetic energy
- Defining KE
- Use of the work-energy theorem
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- 6th/7th:
- Power Lab due
- Work
- W=Fd; Work's unit is joule [J] Read about James Prescott Joule's honeymoon adventures
- Work/Energy theorem (W=deltaK)
- Work is only done if the force is applied for a distance!
- If there is no distance then no work is done
- How much work is done pushing a book down on a desk? none
- How much work is done sliding a book along a desk? W=Fd=frictional force times the distance. frictional force is equal to mu times the normal force
- How much work is done holding a book in a stationary position? none - no distance change
- How much work is done carrying a book up stairs? W=Fd=weight of the book times the height of the stairs. no work is done in the horizontal direction because no force is applied horizontally
- How can you do more work by carrying books up stairs?
- Examples:
- How much work is done lifting a 35 kg concrete block a height of 0.85?
- How much work is done moving the block down a hallway 13 m at constant speed?
- You pull a 42 kg boy on a sled with a rope that makes a 32° angle with the ground. The pull forc is 52 N. How much work is done in moving the boy a distance of 220 m?
- * Kinetic energy
- Defining KE
- Use of the work-energy theorem
- A person does 420 J of work on a box by increasing its speed from rest to 3.5 m/s in 8 s. What is the mass of the box? What is the weight of the box? How much work is needed to make it move 7.0 m/s?
- A car with a mass of 1200 kg is moving 45 m/s. What velocity does a truck with mass 3800 kg need to have the same energy?
- A crate with a mass of 13 kg is pulled up an inclined plane with a constant velocity of 2.5 m/s. The pull force is 84 N parallel to the plane and the plane has an angle of 35°. Calculate: mu, KE, Work by gravity, work by you work to friction, change in potential energy. Show the conservation of energy still works.
Wednesday, December 2
- 5th/6th
- P. 151, 1-6 due
- collect problems
- Kinetic Energy examples
- A person does 420 J of work on a box by increasing its speed from rest to 3.5 m/s in 8 s. What is the mass of the box? What is the weight of the box? How much work is needed to make it move 7.0 m/s?
- A car with a mass of 1200 kg is moving 45 m/s. What velocity does a truck with mass 3800 kg need to have the same energy?
- A crate with a mass of 13 kg is pulled up an inclined plane with a constant velocity of 2.5 m/s. The pull force is 84 N parallel to the plane and the plane has an angle of 35°. Calculate: mu, KE, Work by gravity, work by you work to friction, change in potential energy. Show the conservation of energy still works.
- World's strongest man?
- *Gossamer Condor video Gossamer Albatross and Helios information. The prize is worth about $340,000 today
- 7th
- P. 151, 1-6 due
- Collect problems
- A person does 420 J of work on a box by increasing its speed from rest to 3.5 m/s in 8 s. What is the mass of the box? What is the weight of the box? How much work is needed to make it move 7.0 m/s?
- A car with a mass of 1200 kg is moving 45 m/s. What velocity does a truck with mass 3800 kg need to have the same energy?
- A crate with a mass of 13 kg is pulled up an inclined plane with a constant velocity of 2.5 m/s. The pull force is 84 N parallel to the plane and the plane has an angle of 35°. Calculate: mu, KE, Work by gravity, work by you work to friction, change in potential energy. Show the conservation of energy still works.
Thursday, December 3 - Mr. Flint out ill today
- 5th/6th
- Gossamer Condor video
- *Work on problems in class
- 7th
- Work on problems in class
Friday, December 4
- 5th
- P. 151, 9–14 due
- 7th
- P. 151, 9–14 due
Monday, December 7
- 5th
- Course selection information
- PSSA Pre and post tests
- Bowling ball pendulum problem
- 6th/7th
- Course selection information
- PSSA Pre and post tests
- *Conservation of energy example problems
- Conservative mechanical energy:
- Conservation of energy with the bowling ball. What is its speed at the bottom? Does mass matter?
- How fast is a stone falling after dropping 7.0 m?
- Nonconservative mechanical energy:
- A bird exerts 15 N of force to fly at constant speed for a distance of 25 m.
- A crate slides down a 3.0 m long inclined plane set at a 25° angle. The crate starts at rest and is moving 4.0 m/s at the bottom of the ramp. What is mu?
Tuesday, December 8
- 5th
- Conservation of energy example problems
- Conservative mechanical energy:
- Conservation of energy with the bowling ball. What is its speed at the bottom? Does mass matter?
- How fast is a stone falling after dropping 7.0 m?
- Nonconservative mechanical energy:
- A bird exerts 15 N of force to fly at constant speed for a distance of 25 m.
- A crate slides down a 3.0 m long inclined plane set at a 25° angle. The crate starts at rest and is moving 4.0 m/s at the bottom of the ramp. What is mu?
- 6th/7th
- Hooke's Law
- Demonstrate two spring scales (red and green) with 500g hanging mass
- F=-kX
- PE=1/2 kx2
- Spring constants are like 100 N/m for easy springs, 10000+ N/m for tough springs.
- Stretch is proportional to force until near elastic limit.
- *A spring where k=120N/m is compressed to a distance of 0.45 m. How fast will a 2.5 kg block move if it is accelerated by the spring? What distance will the box move if mu is 0.56?
- A spring is used on a pinball machine to accelerate an 80g pinball. The pinball plunger is pulled back 0.25 m and the ball ends up moving 14 m/s. What is the spring constant of the plunger spring? What is the velocity when the pinball reaches the back of the machine (a distance of 1.2 m and an angle of 8°)
- Intro. to Conservation of Energy lab
Wednesday, December 9 – No School – Snow Day
Thursday, December 10
- 5th/6th
- Hooke's Law
- Demonstrate two spring scales (red and green) with 500g hanging mass
- F=-kx
- PE=1/2 kx2 since F is average force
- Spring constants are like 100 N/m for easy springs, 10000+ N/m for tough springs.
- Stretch is proportional to force until near elastic limit.
- *A spring where k=120N/m is compressed to a distance of 0.45 m. How fast will a 2.5 kg block move if it is accelerated by the spring? What distance will the box move if mu is 0.56?
- A spring is used on a pinball machine to accelerate an 80g pinball. The pinball plunger is pulled back 0.25 m and the ball ends up moving 14 m/s. What is the spring constant of the plunger spring? What is the velocity when the pinball reaches the back of the machine (a distance of 1.2 m and an angle of 8°)
- Intro. to Conservation of Energy lab
- 7th
- Conservation of Energy lab
Friday, December 11 – Many students absent due to SSAs
- 5th
- Hybrid vehicle information
- 7th
- Hybrid vehicle information
Monday, December 14
- 5th
- P. 151; 19, 21–25 due
- 6th/7th
- P. 151; 19, 21–25 due
- *Work done by variable forces
Tuesday, December 15
- 5th
- P. 152, 26–31 due
- 6th/7th
- P. 152, 26–31 due
- *More about hybrid vehicles
Wednesday, December 16
- 5th/6th
- P. 154, 48-53 due
- Work done by variable forces
- 7th
- P. 154, 48-53 due
- Go over problems
Thursday, December 17
- 5th/6th
- P. 154, 55-57, 59, 62 due
- Go over problems
- 7th
- P. 154, 55-57, 59, 62 due
- Go over problems
Friday, December 18
- 5th/6th
- Return Monday's homework
- Chapter 5 Review due
- *Car Collisions: It's basic physics
- Intro. to My Car's Safety
- 7th
- Return Monday's homework
- Chapter 5 Review due
Monday, December 19
- 5th
- Chapter 5 Test
- 7th
- Chapter 5 Test
Tuesday, December 20
- 5th
- Conservation of Energy Lab due
- Momentum and collisions
- 6th/7th
- Conservation of Energy Lab due
- Car Collisions: It's basic physics
- Intro. to My Car's Safety
- *Momentum and collisions
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