Physics

• Rigid bodies and non-rigid bodies are two types of extended bodies
• Rigid body


  Fixed and definite shape, shape does not change, distance between all pairs of particles does not change
• Non-rigid body


  Can change shape under the influence of forces, can bend and deform
• Types of motion for a rigid body

  • Translational motion
  • Rotational motion
• Translational motion


  Body moves as a whole, all particles have the same velocity
• Types of translational motion

  • Rectilinear motion (straight line)
  • Curvilinear motion (curved path)
• In translational motion, the line joining any two internal points of the body remains parallel
• Rotational motion


  Body rotates around a fixed point (pivot), all points move in circular motion about the axis of rotation
• A fixed pivot is not necessary for rotational motion, the body can rotate about its center of mass
• Spin motion


  Rotational motion without a fixed pivot, force should not be applied at the center of mass
• Types of motion


  • Translational motion
  • Rotational motion
  • Planar motion (combination of translational and rotational)
• If a rigid body is pivoted (fixed at a point), it can only have rotational motion
• If a rigid body is not pivoted, it can have pure translational motion or a combination of translational and rotational motion
• A spinning top has mainly rotational motion, with little translational motion of the pivot
• A fancy top can have both translational and rotational motion
• A box sliding down an inclined plane has translational motion
• A cylinder sliding down an inclined plane has a combination of translational and rotational motion
• Other types of motion

  • Oscillatory motion
  • Periodic motion
  • Random motion
• The video discusses the two major types of motion: translational and rotational
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