Physics mechanics

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related to unit 2 of 11th class

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Physics mechanics

  1. 1. PHYSICS
  2. 2. MECHANICSUNIFORMMOTIONUNIFORMLYACCELERATEDMOTIONVECTORSMOTION IN APLANE
  3. 3. WHAT IS SCIENCEScience ScientiaScience is not just a collection ofLaws,a catalogue of unrelated facts.it is a creation of Human mind,withthe freely invented ideas and concepts.The task of Science is both to extend the rangeof our experience and to reduce it to order.The two processes , that of science and that ofArt are not very different .Both Science and Art , form in the course of centuries, a human language , by which we can speak about the more real part of reality.
  4. 4. The Branch Of Physics Which Deals With The Study Of Motion OfMaterial Objects Is Called -- MECHANICSMECHANICSStaticsKinematicsDynamics
  5. 5. OBJECT IN MOTION
  6. 6. Types of motion-(1)Rectilinear or Translatory motionRectilinear motion-is that motion in which a particle or pointmass body is moving along a straight line.Translatory motion-is that motion in which a body , which isnot a point mass body is moving such that all constituentparticles move simultaneously along parallel straight lines andshift through equal distance in a given interval of timeRectilinear or translator motion can be uniform or non-uniform
  7. 7. (2) Circular or Rotatory motion-Circular motion-is that motion in which a particle or a pointmass body is moving on a circle.Rotatory motion-is that motion in which a body , which is nota point mass body , is moving such that all its constituentparticles move simultaneously along concentric circles ,whose centre lie on a line, called axis of rotation and shiftthrough equal angle in a given time.Circular or rotatory motion can be two dimensional or threedimensional motion and can be uniform or non-uniformmotion
  8. 8. 1-d motion-A motion in which one co-ordinate change out ofthree co-ordinates specifying the position w.r.t time.eg:-linear motionDimensional motion
  9. 9. 2-D MOTION- if the two co-ordinates change out of three co-ordinates specifying the position of objectEg:-motion along a plane3-d motion- if three co-ordinates specifying the position of object w.r.t timeEg:-motion in a space(motion of gas molecules)
  10. 10. UnitsUnits are not the same as quantities!Quantity . . . Unit (symbol)
  11. 11. SI PrefixesLittle Guys Big Guys
  12. 12. Some Physics QuantitiesVector - quantity with both magnitude (size) and directionScalar - quantity with magnitude onlyVectorsVectors are represented with arrows• The length of thearrow represents themagnitude (how far,how fast, how strong,etc, depending on thetype of vector).• The arrow points inthe directions of theforce, motion,displacement, etc. Itis often specified byan angle.42°
  13. 13. Distance vs. Displacementstartstop
  14. 14. Speed vs. Velocity
  15. 15. Speed vs. Velocity
  16. 16. Kinematics Formula Summary1-D motion with constant acceleration:(derivations to follow)• v = u + at• v = (u + v)/2• s = ut +1/2at2• v2 – u2 = 2 a s

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