Category Archives: Grade 11 Physics

Physics Tennis Ball Launch- Sunday at 10AM

Just a reminder to physics students that we will be launching tennis balls on Sunday, January 25, 2009 at 10AM. I will meet you at the residence. Please be ready to go at that time.

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Exam Reminders- January 23, 2009

Just a few reminders for the upcoming exams….

  • The only required material for the math, physics and chemistry exams are pencils, erasers and calculators. Other material (paper, periodic table, etc) will be provided.
  • Please remember to bring all texts and other borrowed material to the exam. These text books will be collected at that time. You are accountable for your texts!
  • Physics students are permitted to bring their formula sheet if there no notes written on them.
  • Anyone with questions about the material can contact me via e-mail or see me during the time frame between exams.

Best of luck!

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Physics- Cumulative Review Problems, January 19, 2009

Physics 11: Cumulative Review Questions

Here are problems from the text that you can try to help you study for the final exam. There are more problems here than you need; try a few from each section to ensure that you cover all the topics.

Text: McGraw-Hill Ryerson’s Physics

Kinematics

  • Page 72 #15-50
  • Page 111 #1, 4
  • Page 116-117 #11-22
  • Page 119 #34-45
  • Page 151 #26-35

Dynamics

  • Page 151 #26-35
  • Page 163 #1-3
  • Page 168 #4-8
  • Page 170 #9-13
  • Page 182 #18-19
  • Page 191 #24-26 (harder set)
  • Page 206 #10, 11, 17
  • Page 208 #23-27, #29-35
  • Page 213 #43

Momentum and Newton’s Laws

  • Page 200 #30-32
  • Page 203 #33-35
  • Page 209 #37-41

Work, Power, Efficiency, Energy

  • Page 221 #1-3
  • Page 225 #4-10
  • Page 235 #14-18
  • Page 238 #19-21
  • Page 245 #22-26
  • Page 254 #30-34
  • Page 258 #35-37
  • Page 261 #38-40, Section Review 1, 6
  • Page 275 #15-20
  • Page 276 #22, 23, 25, 29

Conservation of Energy and Momentum

  • Page 287 #1-8
  • Page 296 #9-14
  • Page 308 #18-24
  • Page 317 #27-29

Waves

  • Page 341 #1-4
  • Page 343 Section Review, #1, 6, 7
  • Page 353 Section Review, #1, 2
  • Page 362 Section Review, #1, 2, 4, 5
  • Page 444 #40, 41, 42, 43, 53, 54, 55, 56, 57

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Physics- Information for Final, January 15, 2009

Physics 11: Exam Information

General Exam Info

The grade 11 chemistry final is divided into 2 sections:

  1. Oral Component (10% of final grade)
  2. Written Component (40% of final grade)

The oral exam will be conducted on Wednesday January 21. The oral exam is 5-10 minutes long and will require you to discuss a topic that we studied in class.

The written exam will be on Monday January 26th from 9AM-12PM.

Review Dates

In-class review time will be provided on January 19, 20 and the 21st.

Availability

There will be additional time available outside of class on the following dates:

Monday, January 19- 3:00-4:30PM (general)

Wednesday, January 21- 12-12:30PM (physics only)

Tuesday, January 20- 4:00-5:00PM (by request only)

Please bring questions or issues to tutorials to help structure the tutorial.

Topics Covered

All the topics covered in the semester may appear on the exam. There is greater weight on post-midterm material than there is on pre-midterm material.

  • Average Displacement, Velocity and Acceleration
  • Instantaneous Displacement, Velocity and Acceleration
  • Constant Displacement, Velocity and Acceleration
  • Scalar and Vector Quantities and Representations
  • Acceleration Due to Gravity
  • Frictional Forces
  • Common Forces
  • Inertia
  • Newton’s Laws
  • Force and Acceleration
  • Forces on Angles
  • Momentum and Impulse
  • Work
  • Mechanical Energy
  • Power and Efficiency
  • Conservation of Total Energy
  • Conservation of Momentum
  • Wave Behaviour
  • Sound and Electromagnetic Waves

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Physics- Egg Drop Failure

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Physics- Energy Transformations, November 25, 2008

Energy Transformations

– We have talked about kinetic, potential, and elastic energy- these are all components of mechanical energy

– Mechanical energy can be conserved or lost, depending on the forces involved

– example: hockey puck that has been hit and slides across the ice- will eventually stop

– example: a perfect pendulum will continue to swing for a very long time

Conservative Forces do work on an object in a way that the amount of work done is independent of the path taken

– Example: gravity is a conservative force
– takes the same amount of work to live a mass a given height, regardless of path that is traveled

Non-conservative forces are path dependent

Example: friction
– The work done against a frictional force depends on whether the path is straight, curved, zig-zagged, etc (consider a crate across the floor)

Work done by conservative forces result in energy changes that are independent of path and are reversible

Work done by non-conservative forces is not reversible

Conservation of Mechanical Energy

when all the work done throughout the energy transformation is done by conservative forces, mechanical energy is conserved

gravity and perfectly elastic materials are conservative forces; no real material is perfectly elastic but come close

The Law of Conservation of Mechanical Energy

When all the work done throughout a process is done by conservative forces, the total mechanical energy of the system after the process is equal to the total mechanical energy of the system before the process.

Ek1 + Eg1 + Ee1 = Ek2 + Eg2 + Ee2

Example: dropping a rock- gravitational potential energy is being transferred into kinetic energy right until it hits the ground

We can use what we know about conservative forces and the conservation of total energy to solve for changing and transforming energy systems.

For homework, please complete page 287 #1-8.

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Physics- Elastic Potential Energy and Hooke’s Law, Monday November 24, 2008

Elastic Potential Energy

– Many objects can stretch, compress or bend (ex. diving board)

– Once the force that was applied to it is removed, some objects can return to its original shape

– This suggests that there was energy stored in the object due to its condition- known as Elastic Potential Energy

Hooke’s Law

Springs are an example of a type of object with elastic potential energy
When a force causes a spring to stretch, the spring exerts a force in a direction that will return it to its original length
– This is known as a restoring force
– Always acts in a direction opposite that in which the spring is stretched or compressed

Property of elastic objects is known as Hooke’s Law

Hooke’s Law: The applied force is directly proportional to the extension or compression of a string

The data produces a straight line with the equation y=mx+b where m is the slope and b is the y intercept

o The slope of a line describing a spring is known as the spring constant (k)

o Spring constant is in the unit N/m

o Each spring has its own constant; it tells us the amount of force that is necessary to stretch or compress the spring a given amount

o The zero position is generally designated to the spring when there is no force applied (thus the y intercept is zero)

Hooke’s Law

Fa= -kx

Fa= force applied (N)

K= spring constant (N/m)

X= amount of compression or stretch (m)

The equation is negative because the restoring force always acts in opposite direction of the displacement (x)

Elastic Potential Energy

The elastic potential energy of a perfectly elastic material is ½ of the product of the spring constant and the square of the length of extension or compression.

Ee= ½kx2

For homework, please complete:

Page 258, #35-37

Page 261, #38-40, Section Review Questions 7, 9

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