work done by a force

• What is the definition of work done?

  Energy transferred from one store to another
• What are the two types of work discussed in the video?

  • Mechanical work: using a force to move an object
  • Electrical work: current transferring energy
• How do you calculate work done?

  Work done = force × distance
• What is the speed of the car before braking?

  20 m/s
• What happens to the kinetic energy of the car when the brakes are applied?

  Transferred to thermal energy in the brakes
• What force is applied to the brakes of the car?

  2,000 Newtons
• What distance does the car travel while braking?

  20 meters
• How do you calculate the work done when braking?

  Work done = force × distance
• What is the work done when the car brakes?

  40,000 Joules
• What are the key points about work done discussed in the video?

  • Work done is energy transfer.
  • Mechanical work involves force and movement.
  • Work done can be calculated using the formula.
  • Examples include a dog pulling a sledge and a car braking.