Work Done

• What are the ways energy can be transferred?

  Sound, light, electrical energy, conduction, convection, radiation
• What is work done in terms of energy transfer?

  Work done is the same as energy transferred
• How is work done measured?

  In joules
• What is the equation for calculating work done?

  Work done = force × distance
• What is a simple machine?


  A device that helps reduce force needed
• How do levers function as simple machines?

  They multiply force needed to lift objects
• How does the distance from the pivot affect the force applied in a lever?

  More distance allows smaller force to lift
• What happens to the work done when using a lever?

  Work done remains the same at both ends
• What are gears used for in machines?

  To change force, direction, or speed
• How do gear systems work on a bicycle?

  They connect pedals to rear wheel for efficiency
• What gear combination is best for going uphill on a bike?

  Smallest gear in front, largest in rear
• Why is it easier to pedal in a smaller gear?

  It requires less force to turn pedals
• What happens when you use the largest gear in front and smallest in rear?

  More force needed, but bike goes faster
• How do adjacent gears interact when one is turned?

  They turn in opposite directions
• What are the functions of complex gear systems in machines?

  • Change force applied
  • Change speed of movement
  • Change direction of movement
  • Improve efficiency of operation