Resultant Forces

• What is meant by a resultant force?

  It is a single force that has the same effect as all of the original forces acting together.
• What are the characteristics of forces?

  • Forces are pushes or pulls acting on an object.
  • They are vector quantities, meaning they have both magnitude (size) and direction.
• What is the unit of force mentioned in the document?

  Newton
• How do you calculate the resultant force when two forces are acting in opposite directions?

  By subtracting the smaller force from the larger force.
• If a man applies a force of 20 Newtons to the right and a friction force of 10 Newtons acts to the left, what is the resultant force?

  10 Newtons acting to the right.
• What does a resultant force of zero indicate about the forces acting on an object?

  The forces are balanced.
• How do you represent forces in a Freebody diagram?

  • The object is shown as a point.
  • Forces are drawn as arrows starting at the point.
  • The length of the arrow represents the size of the force.
  • The direction of the arrow indicates the direction of the force.
• What is the upward force acting on a skydiver called?

  Air resistance
• What does it mean when an airplane is flying at a constant altitude?

  The forces acting on it are balanced.
• What forces act on an airplane flying at a constant velocity?

  • Weight acting downwards
  • Lift acting upwards
  • Thrust acting forwards
  • Air resistance (drag) acting backwards
• What is the driving force of a car mentioned in the document?

  10,000 Newtons
• If a car experiences a friction force of 4,000 Newtons and air resistance of 5,000 Newtons, what is the total force acting to the right?

  9,000 Newtons acting to the right.
• What does it indicate if the resultant force is 1,000 Newtons acting to the left?

  The driving force is less than the total opposing forces.