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Unit 3-Energy and Momentum

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Mr Stephens' Homepage
---------------- Physics Home
----------------- Semester 1
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Unit 1-Nature of Science
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Unit 2-Motion and Forces
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Unit 3-Energy and Momentum
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Unit 4-Heat and Thermodynamics
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Semester 2
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Unit 5-Waves
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Unit 6-Electricity and Magnetism
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Unit 7-Review and Final
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Unit 8-Final Projects

Main Concepts

Follow white links to reading assignments and red links to multimedia

1. Momentum

a. Momentum and Impulse (Multimedia)

b. Applications

2. Law of Conservation of Momentum (Multimedia)

a. Action/Reaction

b. Momentum Conservation (Astronaut Catch Animation)

c. Isolated Systems (Inelastic Collision Animation)

d. Equations for Problem Solving (The Cart and the Brick Animation A and B, Car Rear Ends Truck I, Truck Rear Ends Car I, Car Rear Ends Truck E, Truck Rear Ends Car E , Head On Collision I, Head on Collision E, 2D Collsion)

e. Equations for Thinking (Little Fish Caught by Big Fish)

f. Explosions

3. Work and Energy

a. Work (Which path requires the most work?)

i. Definition

ii. Calculations

b. Energy (Conservation of Energy)

i. Potential (Multimedia)

ii. Kinetic

iii. Mechanical (Roller Coaster, Projectile, Pendulum)

c. Power (Multimedia)

4. Work and Energy Relations (Multimedia)

a. Internal vs. External Forces (Hotwheels comes to a Stop)

b. Situations with External Forces

c. Situations in which Energy is Conserved

d. Application and Practice

e. Bar Chart Illustrations (How far will it skid?, How High Will it Go?)


Images

Main Questions

What is the relationship between momentum and impulse?

What is the relationship between work and energy?

How do you calculate the force, impulse, momentum, kinetic energy, and potential energy of various systems?

Vocabulary

Click Here for Words and Definitions

Equations

Newton's Second Law: f = ma (force equals mass times acceleration)

Momentum: p = mv (momentum equals mass times velocity)

Conservation of Momentum: m1v1 + m2v2 = m1v1' + m2v2' (mass one times velecity one plus mass two times velocity two before the interaction equals mass one times mass two plus mass two times mass two after the interaction)

Impulse: i = f *∆t (impulse equals force times change in time)

Impulse equals change in momentum: f *∆t = m∆v (force times change in time is equal to mass times change in velocity)

Total mechanical energy: TME = PE + KE (total mechanical energy is equal to potential energy plus kinetic energy)

Kinetic Energy: KE = 1/2∙m∙v2 (kinetic energy is equal to the velocity squared times mass times one half)

Potential energy of gravity: PEgrav=m∙g∙h (potential energy of gravity is equal to mass of the object times the acceleration of gravity times the height of the object.

 

Demos

  • Pendulum to the Face
  • Amazing Spinning Bicycle Wheel
  • Amazing Spinning Bicycle Wheel and Rotation Plate
  • Conservation of Angular Momentum on Rotation Plate
  • Energy Calculation of a Pendulum
  • Euler's Disk
  • Basketball and Tennis Ball Drop
  • Maxwell's Wheel

 

Additional Readings


Videos

 

Documents

 

Online Activities

  • Minds On Physics Modules-Shockwave Needed
    • Momentum and Collisions
      • Momentum
      • Impulse and Momentum Change
      • Impulse Momentum Change Variables
      • Force, Impulse and Momentum Change
      • Momentum Conservation
      • Explosion Like Impulse
      • Momentum Conservation
      • Problem Solving Inelastic Collisions
      • Problem Solving Elastic Collisions
      • Momentum and Proportional Reasoning
    • Work and Energy
      • Work
      • Power
      • Kinetic and Potential Energy
      • Total Mechanical Energy
      • Conservative and Non-conservative Forces
      • Work-Energy Bar Chart Analysis
      • Energy Conservation
      • Energy Conservation-Mathematical Analysis
      • Work and Energy Conversions
      • Work and Energy Conversion-Mathematical Analysis
  • Physics Education Tech
    • The Ramp-Examines the relationship between forces, friction, and energy.
    • Energy Skate Park-Examines conservation of energy in a virtual skate park.

PowerPoints

Links