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2/3 AP: Momentum

photo showing cue ball breaking a triangle of billard balls

Momentum is a conserved property of a system. This conservation can be demonstrated by using Newton’s third law (Fa/b = -Fb/a) to develop the equation:

photo showing cue ball breaking a triangle of billard balls

mΔva + mΔvb = 0

Momentum is given the lowercase p as its symbol.

The change in momentum (Δp) of an object is defined as impulse.

Impulse = Δp = mΔv = FΔt

Keep in mind that while momentum depends on the same variables as kinetic energy (mass and velocity), momentum and kinetic energy are not the same thing. Momentum is always conserved, but, while energy is conserved, it can move from kinetic storage storage to gravitational, elastic, thermal, etc.

Today’s work

Some videos to help your understanding

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11/19 Crossword puzzle review

Here is a word bank for today’s crossword puzzle

  • Applied
  • Balanced
  • Buoyant
  • Conductor
  • Controlled
  • Convection
  • Convergent
  • Core
  • Density
  • Dependent
  • Distance
  • Divergent
  • Drag
  • Elastic
  • Electrical
  • Energy
  • Friction
  • Furthest
  • Gravity
  • Horizontal
  • Independent
  • Insulator
  • Interaction
  • Kinetic
  • Largest
  • Learnphysics
  • Loop
  • Lower
  • Magnetic
  • Mantle
  • Mass
  • More
  • Net
  • Newton
  • Normal
  • Perpendicular
  • Shell
  • Smallest
  • Static
  • Strength
  • Tension
  • Transform
  • Uranus
  • Vertical
  • Weight
  • Yes
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19-11-14: A few force videos

Video list

The videos today are all from Flipping Physics.

  • Introduction to Free Body Diagrams or Force Diagrams
  • 5 Steps to Solve any Free Body Diagram Problem
  • A Three Force Example of Newton’s 2nd Law with Components
  • AP Physics 1: Dynamics Review (Newton’s 3 Laws and Friction)

Remember that as you watch these videos, when a problem/question is presented, try writing out the answer before you continue with the video–then check yourself as you progress through the video.

Flipping Physics: Introduction to Free Body Diagrams or Force diagrams

Produced by Flipping Physics
Continue reading “19-11-14: A few force videos”
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19-11-14 Getting ready for forces quiz

Today’s assignment from textbook:

p. 110-112: 20, 37, 38, 39, 41 and 51.

What you need to know for tomorrow’s quiz:

  • Use of first five equations in your equation sheet
  • Draw force diagrams
  • Evaluate forces to determine balanced/unbalanced net force
  • Special circumstances/types of problems
    • Solve problems with pulleys (pulleys change direction of tension, not magnitude)
    • Solve problems with ramps
  • Solve problems with forces at angles
    • Break down forces into x and y components
    • Solve triangle math using SOHCAHTOA and law of sines

Additional resources

You an find instructional/tutorial videos here.