types of friction

• Reducing friction

  Use lubricants like oil or grease to make surfaces slide more easily
• Types of friction

  1. Static friction

  2. Sliding friction

  3. Rolling friction
• Static friction

  • Keeps objects at rest
• When you rub your hands together vigorously, you can feel them getting warmer due to the conversion of kinetic energy into thermal energy
• Rolling friction


  • Occurs when an object rolls over another surface
• Friction helps us walk without slipping, stop our cars when we hit the brakes, and even hold a pencil while we write
• Friction

  The force that opposes the motion of objects when they rub against each other
• Factors affecting friction


  Surface texture, force pressing the surfaces together, type of materials in contact
• In the vacuum of space, there is still some friction when objects move against each other due to molecular interactions at their surfaces, known as dry friction or Surface adhesion
• Sliding friction


  • Occurs when objects are already in motion
• Examples of friction

  • Shoes making a squeaky sound on a shiny floor
  • Easier sliding on a slippery slide compared to a rough one
• Fluid friction

  Fluids exert a force of friction when objects move through them
• Viscosity


  A fluid's resistance to flow
• Aeroplanes, fish, and ships are shaped to minimize fluid friction
• Higher speed of the object results in greater frictional force
• Drag


  The frictional force exerted by fluids
• Dry friction


  The friction between solid parts
• Fluid friction depends on the nature of the fluid
• Streamlining is giving an object a particular shape to decrease fluid friction
• Major states of matter

  • Solid
  • Liquid
  • Gas
• Friction exists not only between solid parts but also between fluids like air and water
• Air offers resistance when objects move through it
• Factors on which fluid friction depends

  • Nature of the fluid
  • Speed of the object flowing through the fluid
  • Shape of the object
• Water is more viscous than air, leading to more friction
• Fluid friction

  The force of friction due to fluids
• Fluid friction depends on the speed of the object traveling through the fluid
• Water offers resistance when objects move through it
• Fluid friction depends on the thickness of the fluid
• Streamlining greatly reduces the resistance offered by the fluid
• Fluids


  Liquids and gases, which have no fixed shape and can be easily deformed