Resultant forces

• What is a resultant force?

  A single force equivalent to multiple forces
• How do you calculate the resultant force acting in a straight line?

  Subtract the smaller force from the larger force
• If a man pushes a box with 20 Newtons right and friction is 10 Newtons left, what is the resultant force?

  10 Newtons acting to the right
• How do you find the resultant force when multiple forces act in different directions?

  Calculate total forces in each direction
• What is the resultant force on a car with a driving force of 10,000 Newtons left and friction plus air resistance of 9,000 Newtons right?

  1,000 Newtons acting to the left
• What does it mean when forces are balanced?

  The resultant force is zero
• What does the length of the arrows in a Freebody diagram indicate?

  The size of the force
• What must be true for an airplane flying at constant altitude?

  Forces must be balanced
• What is the force provided by the engines of the airplane called?

  Thrust
• What does drag refer to in the context of an airplane?

  Air resistance acting against the airplane
• How do the forward and backward forces relate when an airplane moves at constant velocity?

  They must be balanced
• What are the steps to draw a Freebody diagram?

  • Represent the object as a point
  • Draw forces as arrows starting at the point
  • Length of arrows shows force size
  • Direction of arrows shows force direction
• What are the forces acting on an airplane flying at constant altitude?

  • Weight acting downwards
  • Lift acting upwards
  • Thrust acting forwards
  • Drag acting backwards
• What are the key concepts of resultant forces discussed in the video?

  • Definition of resultant force
  • Calculation of resultant forces
  • Importance of Freebody diagrams
  • Examples of forces acting on objects