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FORCE DEFINED

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Presentation Transcript

  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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