Transcript Physics on Deck - Seneca High School

Physics on Deck
January 2008
January 6, 2010
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What’s up?
For the short term: Chapter 5. Work and
Power.
Conservation of momentum
Circular or Rotational Motion . Radians,
anyone?
Universal Gravitation.
Conservation of Momentum
And then..
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We start the second term:
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Wave mechanics
Sound
Light
Optics
Electrical fields
Electrical circuits
Magnetism
Quantum Physics
Relativity
January 7
January 12
January 14
Thursday, February 4
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Quiz: Angular and tangential velocity and
acceleration.
New discussion: Centripetal force
Video: Kepler’s Laws.
Assignment: 7G and 7H
Monday, February 8
2009-2010
January 19
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Last of workbook assignments due.
Finish quiz on Collisions at an angle.
Finish lab on Conservation of Momentuinternal force.
Do lab on Conservation of momentum –
collisions at an angle.
Thursday Jan 21: Test Chapter 6
So for today…
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Work and Power
Assignment: 5A and 5B
January 7, 2009
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Teacher absent.
Quiz: Work and Power
Bonus: Meet the neighbors
Homework: 5F
January 9, 2009
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Assignment due: 5F Power
New discussion: Work – Potential Energy –
Kinetic Energy theorem.
Assignment: 5B and 5C
January 13, 2009
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Assignment due: 5B, 5C
Quiz: Work, power, Kinetic and Potential
energy.
Video: Conservation of energy
Assignment due next time: 5D, 5E
Impulse momentum theorem
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A mass of 10.0 kg is accelerated from 5 m/s
to 12 m/s in 2 seconds. Calculate the change
in momentum, the impulse required, the force
that must be applied and the distance traveled
in this event.
Linear collision
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Glider A of mass 0.355 kg moves along a
frictionless air track with a velocity of 0.095
m/s. It collides with glider B of mass 0.710
kg moving in the same direction at a speed of
0.045 m/s. After the collision, glider A
continues to move in the same direction but
with a velocity of 0.35 m/s. What is the
velocity of B after the collision? Review this
problem in 2009
Collisions at an angle.
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Sample problem 2.
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A 0.5 kg ball collides with another ball at rest
of mass 1.0 kg. After the collision, the 1.0 kg
ball moves away at an angle of 60o with a
velocity of 2.0 m/s. The 0.5 kg ball rolls at an
angle of 135 at 3.0 m/s. What was the
momentum of the 0.5 kg ball before the
collision?
Collisions at an angle..
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Sample problem 1
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Two bicyclists approach an intersection, one
from the east with a mass of 110 kg and one
from the south with a mass of 140 kg and is
traveling at 25 m/s. They collide and the
bicycles become locked together. The two
move and an angle of 300o. What was the
speed of the 110 kg cyclist?
Collisions at an angle
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Sample problem
An object of mass 15.0 kg and a velocity of 2.00
m/s collides with a stationary object having the same
mass. After the collision, the first object moves
along a line that makes an angle of 400 to the right of
the original path. The second object moves at an
angle of 100o to the left of the path of the first object
after the collision. A) Determine the momentum of
each object after the collision. B) Calculate the
speed of each object after the collision.
Wednesday, January 28
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Assignment due: 6A
Review discussion: Momentum and change
of momentum./
New discussion: Linear collisions.
Assignment: 6B and 6D
Friday, January 30
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6B and 6D due
Quiz: Momentum, change in momentum,
linear collisions.
Discussion: Stopping distance. Collisions at
an angle.
Lab: Conservation of Momentum
Tuesday: Part II : 4 problem test on Chapter 5.
Sample problem
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Stopping distance.
A 2500 kg car traveling to the north is slowed down uniformly from an
initial velocity of 20.0 m/s bya 6250 N braking force acting opposite the
car’s motion. Use the impulse momentum theorem to answer the
following questions:
A. What is the car’s velocity after 2.50 seconds?
B. How far does the car move during the 2.50 seconds?
C. How long does it take the car to come to a complete stop?
Tuesday, February 3
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Retake of test – problem section
6C due
Thursday, February 5
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Lab: Conservation of momentum – Collision
in 2 dimensions report due Monday Feb. 9
Quiz: Conservation of Momentum
Notes: Conservation of energy and
momentum; elastic and inelastic collisions.
Lab: Conservation of Momentum – internal
force.
Internal force
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An astronaut at rest in space with a mass of 84
kg fires a thruster that expels 85 g of hot gas
at 875 m/s. What is the velocity of the
astronaut after firing the shot?
Explosions – internal force
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An explosion blows a rock into three parts by
internal force. Two pieces go off at right
angles to each other; a 1.0 kg piece at 12 m/s
and a 2.0 kg piece at 8.0 m/s. The third piece
flies off at 40 m/s. What is the mass of the
third piece? What was the mass of the rock?
Monday, January 28
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Intro to circular motion.
Rotational kinematics and radians; angular
displacement, angular velocity, angular
acceleration.
Assignment due Wednesday 7A, 7B
Assignment due Friday 7C
Assignment due Tues, Feb 5 7D
Tuesday, March 3 2009
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One more quiz on Circular Motion
More on Kepler….
Law of Universal Gravitation
Understanding the concept – formula work
TEST: Thursday Chapter 6 and 7.
Thursday, March 5 2009
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TEST: Momentum and circular motion
Monday, March 9
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Assignment due: Parachutes and terminal V.
Class discussion: Torque and equilibrium of
torque.
Classwork problems
Assignment 8A – due Friday.
Wednesday, March 11, 2009
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Video: Torque
Quiz: Torque
Discussion: Equilibrium of Forces.
Classwork: Problems on equilibrium of
forces. 8B due Friday.
Postpone Pendulum lab until Friday.
Friday, March 13
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Teacher absent.
Video: Torque
Lab: Pendulum. Submit with pendulum
problems. Done and submitted in class.
Discuss: Factors that affect the behavior of a
pendulum.
Classwork: Problems on equilibrium of
forces.
Tuesday, March 17
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Quiz: Torque
Discussion: Wave-Mechanics and Sound.
Notes
Next Thursday: Lab: Wave Mechanics
Thursday, March 19
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Lab: Properties of waves.
Monday, March 30
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Notes: Characteristics of waves. Sound.
Video: Understanding Time. (53 minutes)
Assignment: Bonus. Ocean Waves – due
Friday, April 3
Waves and Sound: Exercises 1-4 and
Additional Exercises 1-5
Wednesday, April 1
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New quiz on Torque
Notes/discussion. Sound Intensity and the
Decibel scale.
Friday, April 3
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Quiz: Sound
New discussion: Decibel scale/Doppler
effect.
Problems due: Sound worksheet #2
Tuesday, April 7
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Quiz: Doppler effect, beats, decibel scale.
Intro to Light unit
Set up Ripple tanks.
Wednesday, April 8
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Finish lab on Waves in a Ripple Tank.
Test: Wave Mechanics and Sound on
Tuesday April 14
Tuesday, April 14
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Unit test: Wave Mechanics and Sound
Lab: Images from flat mirrors
Thursday, April 16
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Assignment due: #13 Reflection and
Refraction #1-4
Finish lab on Flat Mirrors.
Begin lab on Curved Mirrors.
Tuesday, April 21
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New discussion/Review : Finding images
using diagrams.
Finding images using the Mirror Equation.
Finish lab: Curved Mirrors
Assignment for April 27. 14B and 14C.
Quiz: Mirrors
Monday, April 27 09
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Quiz: Mirrors and speed of light.
Assignment due: Curved mirrors.l
Finish and submit lab on Curved Mirrors
New discussion: Snell’s Law of Refraction.
Begin Lab on Snell’s Law.
Monday, February 11
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New discussion: Law of Universal
Gravitation
Video: Navigating in Space
Wednesday, February 13
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Quiz: Circular motion; angular and tangential
values.
Lab: The Pendulum’
New discussion/Notes: Satellites, minimum
velocity, escape velocity. Pendulum. Torque.
Due Friday: Universal Gravitation worksheet.
Due Wednesday: Test Chapter 7 and extras.
Friday, February 15
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Lab due: The Pendulum
Quiz Universal Gravitation
Review discussion: Hooke’s Law – simple
harmonic motion.
TEST on Wednesday _ Circular Motion and
Universal Gravitation.
Wednesday, February 20
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Test: Circular Motion and Universal
Gravitation
Assignment: Accelerating and braking on
turns.
Friday, February 22
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Logic activity : The Box
Review discussion: Escape velocity and
orbiting velocity.
New discussion: Torque
Assignment: Practice 8A and Accelerating
and Breaking on Curves.
3 Bonus assignment – 2 due on Tuesday, One
on Thursday
Tuesday, March 4
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Quiz: Torque
Video: Standard deviants Conservation of
angular momentum.
New discussion/Waves and energy transfer/
Lab: Wave properties. (Slinky)
Monday, March 10
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Lab: Properties of waves due
Quiz: Characteristics of waves
ReviewNotes/discussion: Behavior of waves
at boundaries
New discussion: Inteference
Lab: Waves in a Ripple tank.
Assignment: Problem 14A
Wednesday, March 12
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Video: The Phenomenon of Sound
Textbook assignment: Read 480-486, Do
section review at the end.
Friday, March 14
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Reteach : Superposition of waves
(interference).
Finish notes through Sound. Next time
Doppler Effect and Decibel scale
Finish Ripple tank lab.
Discussion/review: Interference or the
superposition of waves.
Class practice.