resultant forces

• What is a force?

  A push or pull on an object
• Why are forces considered vector quantities?

  They have both magnitude and direction
• If a man pushes a box with 20 Newtons to the right and friction is 10 Newtons to the left, what is the resultant force?

  10 Newtons to the right
• What is the resultant force?

  A single force equivalent to all original forces
• How do you calculate the resultant force when two forces act in opposite directions?

  Subtract the smaller force from the larger
• What is the resultant force on the car if the driving force is 10,000 Newtons and the total opposing force is 9,000 Newtons?

  1,000 Newtons to the left
• What force acts downwards on a skydiver?

  Weight due to gravity
• What happens to the resultant force when a skydiver experiences equal upward and downward forces?

  The resultant force is zero
• What is a Freebody diagram?

  • Represents an object as a point
  • Shows forces as arrows starting from the point
  • Arrow length indicates force size
  • Arrow direction indicates force direction
• What does the altitude of an airplane refer to?

  Height above the ground
• What force acts upwards on an airplane at constant altitude?

  Lift
• How do the forces acting on an airplane at constant velocity compare?

  They must be balanced
• What is the force of air resistance also known as?

  Drag
• What are the steps to calculate resultant forces?

  1. Identify all forces acting on the object
  2. Determine the direction of each force
  3. Add forces acting in the same direction
  4. Subtract opposing forces
  5. The result is the resultant force
• What are the key concepts related to resultant forces?

  • Resultant force is a single equivalent force
  • Forces can be balanced or unbalanced
  • Vector quantities have magnitude and direction
  • Freebody diagrams help visualize forces