Reducing unwanted energy transfers

• What is the main focus of the video discussed in the study material?

  To explore how to reduce unwanted energy transfers using thermal insulation and lubrication
• What is the primary goal of reducing energy loss in a house?


  To keep the home warm
• What is convection in the context of heat transfer?


  Heat transfer through liquids and gases
• What is one method to prevent heat loss by convection in a house?


  Using foam seals around doors and windows
• How do thick walls help in reducing heat loss?


  They are made from materials with low thermal conductivity
• What are cavity walls and how do they reduce heat loss?


  Cavity walls have two layers of bricks with an air gap that reduces conduction
• Why is air considered a poor conductor of heat?


  Because it does not transfer heat effectively
• What is the purpose of insulating foam in cavity walls?


  To fill the gap and reduce both convection and conduction
• What is the difference between single glazing and double glazing?


  Single glazing has one pane of glass, while double glazing has two panes with an air gap
• How does double glazing reduce heat loss?


  By having an air gap that prevents conduction
• What is friction in the context of energy transfer?


  The resistance encountered when an object moves over a solid or through a fluid
• Why is reducing friction important for energy efficiency?


  It prevents energy loss and reduces heating of objects
• How can oil be used to improve cycling efficiency?


  By reducing friction between the cogs and chain
• How does streamlining vehicles like cars and planes help with energy efficiency?


  It reduces air resistance, allowing them to use less fuel
• What is the main takeaway from the video regarding energy loss?


  Understanding principles to suggest ways to reduce energy loss