Download - Chapter 12 Concept Review Each table will work as a team to earn points by answering questions. There will be approximately 60 seconds to answer each.

Chapter 12 Concept Review

• Each table will work as a team to earn points by answering questions.

• There will be approximately 60 seconds to answer each question from the time I am done reading unless otherwise noted.

• Answers will be recorded and presented on the whiteboards at each team table.

• Correct answers will earn the points denoted by the question. Incorrect answers will not be penalized.

• The choice of category and question will rotate among teams. • At Final Jeopardy, each time may wager all of their earned

points, or $500, whichever is greater.• The winning team will earn 2 points of extra credit each on

tomorrow’s test.

Strategy

• Work together with your team.

• Talk quietly but discuss possible options. Make sure to write down your solution before time runs out.

• After each question and answer we will have time to discuss and answer questions.

JeopardySimple Harmonic Motion

Measuring SHM

Properties of Waves

Wave Interactions Potpourri

Q $100

Q $200

Q $300

Q $400

Q $500

Q $100 Q $100Q $100 Q $100

Q $200 Q $200 Q $200 Q $200

Q $300 Q $300 Q $300 Q $300

Q $400 Q $400 Q $400 Q $400

Q $500 Q $500 Q $500 Q $500

Final Jeopardy

$100 Question from Simple Harmonic Motion

• Objects that behave according to Hooke’s Law have a restoring force that is proportional to their ______________.

$100 Answer from Simple Harmonic Motion

• Displacement


• Objects will continue oscillating in simple harmonic motion indefinitely, trading potential and kinetic energy back and forth, as long as we ignore the effects of _______.


• Friction!


• A pendulum oscillates in simple harmonic motion as long as its amplitude does not exceed what angle measure?


• 15 degrees


• Hooke’s Law is expressed as F = -kx. The negative sign is there because…?


• The restoring force is opposite the direction of displacement.


• Objects oscillating in simple harmonic motion have a maximum velocity at what point?


• Equilibrium (the middle!)

$100 Question from Measuring Simple Harmonic Motion

• _________ is a measure of the time it takes for an object to complete a full cycle (one complete back-and-forth motion). The units of this measure are __________.

• (must answer both parts correctly)

$100 Answer from Measuring Simple Harmonic Motion

• Period

• Measured in seconds


• The period of a pendulum depends on its ________.


• Length


• The period of oscillation of a mass-spring system depends on which two quantities?


• Mass of the object

• Spring constant


• If the period of an object’s oscillation is tripled, what happens to the frequency? Be specific.


• The frequency is reduced to 1/3 of its initial value.


• If the mass in a mass-spring system is doubled, and the spring constant is also doubled, what happens to the frequency? Be specific.


• No change. The increases will cancel out.

$100 Question from Properties of Waves

• The difference between mechanical waves and non-mechanical waves is that mechanical waves need _________________________.

$100 Answer from Properties of Waves

• A medium to travel through.

DAILY DOUBLE

• Write your wagers on your whiteboards! You may risk up to all of your points or 1,000, whichever is greater.

Daily Double from Properties of Waves

• A single, non-periodic disturbance sent through a substance is called a ___________.

Daily Double Answer from Properties of Waves

• Pulse wave


• If the frequency of vibration of a medium is increased, what happens to the wavelength?


• Wavelength is decreased. They are inversely proportional to each other.


• Waves are particularly efficient, because although they do not transfer matter from one place to another, they do transfer _________.


• Energy


• A spring being stretched and compressed repeatedly is an example of a wave that is _________ and __________.

• (need both)


• Periodic and longitudinal.

$100 Question from Wave Interactions

• When two pulse waves collide and their displacements are the same side of equilibrium, this is called ____________.

$100 Answer from Wave Interactions

• Constructive interference.


• A wave will be reflected and inverted if the medium through which it is traveling is attached to a _________ boundary.


• Fixed.


• In a standing wave, the point(s) at which there is maximum displacement from equilibrium is(are) called ___________.


• Antinode(s)


• What is the resultant displacement at a position where destructive interference is complete?


• Zero


• A standing wave that has 4 nodes has a wavelength of what fraction of the length of the medium it is traveling through?


• 2/3 of the length of the medium.

$100 Question from Potpourri

• Can two waves occupy the same place at the same time?

$100 Answer from Potpourri

• Of course. This is called interference.


• Are sound waves mechanical waves or are they non-mechanical waves?


• Mechanical. They medium they travel through is air.


• Two tuning forks with frequencies of 256 Hz and 512 Hz are struck. Which of the sounds, if either, will move faster through the air?


• Neither. Wave speeds are constant in a given medium. Frequency and wavelength may change, but not wave speed.


• How does a single point on a string move as a transverse wave passes by that point?


• Up and down. No horizontal movement.


• If the period of a mass-spring system is 2 seconds, what must be done to the mass of the system to increase the period to 6 seconds?


• Increase the mass by a factor of 9. For example, if the mass was originally 4 kg, increase it to 36 kg.

Final Jeopardy

• Grandfather clocks use pendulums to move gears and keep time. If the clock is running slow, how can you adjust the pendulum to fix the problem.

Final Jeopardy Answer

• Make the pendulum shorter. Move the bob closer to the pivot point.