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FORCE DEFINED

Learn about the different forces and properties related to mass, weight, volume, density, and vectors. Understand how these concepts are defined, their relationship to each other, and how to calculate vector composition and resolution.

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FORCE DEFINED

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  1. FORCE DEFINED • Push or Pull • Rub • Blow or Impact • g • causes change in motion or shape of a body

  2. bouyancy centripetal elastic fluid drag fluid lift friction gravity muscle pressure reaction Kinetics - forces

  3. PROPERTIES OF A FORCE • M_____________ • D______________ • P A______________ • L A_______________

  4. MASS • Scalar quantity • common to solids, liquids, gases • measure of INERTIA • direct relationship between Mass & Inertia • Mass and Size NOT always direct • Mass is NOT a Force

  5. WEIGHT • Vector • Weight is a Force • measure of force of g pulling downward • direct relationship between Weight & Mass

  6. VOLUME Objects of similar VOLUME but different MASS • Space that an object occupies • Length, Width, Height • NO relationship with Mass Shot vs Softball Table Tennis Ball vs Golf Ball

  7. DENSITY • Compactness of a body or object • Mass per unit of volume • Examplewater = 9.90 Newtons per liter air = 0.01 Newtons per liter

  8. CENTER of GRAVITY • Center of Mass of an object or body • point where Mass is concentrated • balance point • See Figure C.2 on page 82 • tooth pick on rim of glass

  9. VECTORS

  10. VECTOR COMPOSITION • Identify Resultant Magnitude & Direction • e.g. net force, velocity, acceleration, etc. • Using Trigonometry • e.g. Pythagorean theorem

  11. VECTOR RESOLUTION • Resultant is KNOWN • Find the 2 components that comprise R • Steps:1. draw given vector to a selected scale 2. from vector tail, draw horizontal line & line 3. from head, connect lines to form a rectangle

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