Unit 3 Review

Physics

Learning Targets

  1. 3-1. I can describe the ideal conditions applied to the study of forces (ignoring friction).
  2. 3-2. I can diagram and calculate the horizontal and vertical components of force.
  3. 3-3. I can explain contact forces on the atomic scale using the particle model.
  4. 3-4. I can mathematically describe frictional forces.
  5. 3-5. I can explain and calculate the apparent weight of an object when it’s acceleration is zero
  6. 3-6. I can apply Newton’s first law of motion to mathematically describe and predict the effects of forces on complex systems of objects.

Unit 3 Vocab

Vocabulary

  1. component
  2. equilibrium
  3. free-body diagram
  4. forces
  5. applied
  6. elastic
  7. electrostatic
  8. friction
  9. gravitational
  10. net
  11. normal
  12. tension
  13. nuclear
  14. inertia
  15. system

Newton's First Law

  • "Law of Inertia"
  • "An object at rest will stay at rest unless an outside force act's upon it"
  • "An object will stay in motion unless an outside force acts upon it"
  • Inertia is the tendency of an object to resist change in velocity.

Force Concepts and Inertia

Force


  • Can be push or pull
  • Vector quantity, has direction
  • Contact: touching

Equilibrium

  • No acceleration
  • All forces are balanced
  • Same magnitude and opposite direction

Free Body Diagrams

  • A diagram or model of forces
  • Use vectors (arrows) to diagram forces
  • Tails of arrows should be connected to other tails
  • The object of interest should be labeled as a dot
  • The length of the arrows show magnitude and provide direction of force

Types of Forces

  • Fg - Gravity
  • Fn - Normal
  • Fa - Applied
  • Ff - Friction
  • Fmag - Magnetic
  • Ft - Tension
  • Fnet - Net
  • Fel - Elastic

Formulas / Units / Symbols

  • SOH-CAH-TOA
  • Fnet = F1 + F2 … +Fn
  • F2 = Fx2 + Fy2
  • Newtons (N)
  • 1 N = 1 kg * 1 m/s2

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