Calculating Forces and Work Done

• What does a Free Body Diagram show?

  All forces acting on an isolated object
• What is the purpose of calculating forces and work done?

  To understand energy transfer and motion
• What do arrows in a Free Body Diagram represent?

  Relative magnitudes and directions of forces
• What is meant by component forces?

  Forces acting together as a single force
• What is the resultant force?

  A single force replacing all acting forces
• How do you calculate the resultant force?

  Add forces in the same direction, subtract others
• What does the equation \( F_r \) represent?

  Resultant force
• What happens when a force moves an object?

  Energy is transferred and work is done
• What is equilibrium in terms of forces?

  Forces are balanced and resultant force is zero
• How can you create a closed loop in a scale drawing of forces?

  Draw forces tip-to-tail to scale
• How do you find the magnitude and direction of the resultant force?

  Measure length for magnitude, angle for direction
• What is the formula for work done?

  W = Fs
• What does 1 joule equal in terms of force and distance?

  1 joule = 1 newton metre
• If a box moves due to a force, what happens to its kinetic energy?

  Energy is transferred to the box's kinetic energy store
• What happens when a box does work against frictional forces?

  Temperature of the box increases
• What are the key concepts related to Free Body Diagrams and forces?

  • Free Body Diagrams show all forces on an object
  • Resultant force replaces all acting forces
  • Work done is energy transferred by a force
  • Equilibrium occurs when forces are balanced
  • Component forces act together as a single force
• What are the steps to calculate resultant force using scale drawings?

  1. Draw forces to scale
  2. Arrange forces tip-to-tail
  3. Measure length of resultant force
  4. Determine angle for direction
• What is the relationship between work done and energy transfer?

  • Work done (W) is energy transferred
  • Formula: \( W = Fs \)
  • 1 joule = 1 newton metre