Work Done by a Force

• What does work done mean in terms of energy?

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

  • Mechanical work: using a force to move an object
  • Electrical work: current transferring energy
• What is the equation for calculating work done?

  Work done = force × distance
• If a force of 50 Newtons moves a sledge 3 m, what is the work done?

  150 Joules
• What happens to the kinetic energy when the car brakes?

  It transfers to thermal energy in the brakes
• If a force of 2,000 Newtons is applied and the car stops over 20 m, what is the work done?

  40,000 Joules
• What is the overall concept of work done in physics?

  • Work is done when energy is transferred
  • Involves mechanical and electrical work
  • Calculated using force and distance