Resultant Forces

• What is the purpose of free body diagrams?

  To illustrate forces acting on an object
• What does a sky diver experience while falling?

  Gravity pulling him towards the ground
• What role does drag play in a sky diver's fall?

  It acts as resistance against his fall
• What do the sizes of the arrows in a free body diagram represent?

  The magnitudes of the forces acting
• What do the directions of the arrows in a free body diagram indicate?

  The directions of the forces acting
• What is the normal contact force?

  A force acting perpendicular to a surface
• What is the driving force?

  The force that propels an object forward
• What is a resultant force?

  The single force from multiple forces acting
• How many forces typically act on an object in real situations?

  At least two forces
• What happens when multiple forces act at a single point?

  They can be combined into a resultant force
• How do you find the overall effect of forces acting along the same line?

  Add forces in the same direction, subtract otherwise
• What is the significance of the resultant force on a car?

  It determines the car's overall motion
• What is the term used to describe the single force that represents the combined effect of multiple forces acting on an object?

  Resultant force
• In a free body diagram, what do the sizes of the arrows represent?

  The relative magnitudes of the forces
• What does the direction of the arrows in a free body diagram indicate?

  The direction of the forces
• What force acts in the opposite direction to the motion of a skydiver?

  Drag (air resistance)
• How is the resultant force calculated when forces act along the same line?

  By adding forces in opposite directions
• If a car is moving forward and experiences a forward force of 500 N and a backward force of 300 N, what is the resultant force?

  200 N forward
• What is the name of the force that acts perpendicular to the surface when an object is in contact with it?

  Normal contact force
• Why is the resultant force important in analyzing the motion of an object?

  It determines the overall effect of all forces
• If a skydiver is falling and experiences a downward force of 800 N due to gravity and an upward force of 600 N due to air resistance, what is the resultant force?

  200 N downward
• How does the resultant force affect the motion of an object if it is zero?

  The object remains at rest or moves at constant velocity
• What are the key components of a free body diagram?

  • Arrows representing forces
  • Sizes of arrows indicating magnitude
  • Directions of arrows indicating direction of forces
  • Labels for each force
• What are the forces acting on a skydiver in free fall?

  • Gravity (downward)
  • Air resistance (upward)
• How do you calculate the resultant force when multiple forces act on an object?

  • Add forces in the same direction
  • Subtract forces in opposite directions
  • The net effect is the resultant force
• What is the force that opposes the motion of an object moving through the air?

  Drag (air resistance)
• What happens to the resultant force if all forces acting on an object are balanced?

  The resultant force is zero
• If an object is at rest on a table, what is the resultant force acting on it?

  Zero
• How does the resultant force change if an additional force is applied in the same direction as the existing forces?

  The resultant force increases
• What is the term for the force that acts opposite to the direction of motion due to contact with a surface?

  Friction
• Why is it important to consider the direction of forces when calculating the resultant force?

  Because forces in opposite directions subtract from each other
• If a box is pushed with a force of 100 N to the right and experiences a frictional force of 30 N to the left, what is the resultant force?

  70 N to the right
• How does the resultant force affect the acceleration of an object?

  A non-zero resultant force causes acceleration
• What is the relationship between resultant force and motion?

  • If resultant force is zero, object remains at rest or moves at constant velocity
  • If resultant force is non-zero, object accelerates in the direction of the resultant force
• What are the forces acting on a car moving at constant speed on a flat road?

  • Engine force (forward)
  • Air resistance (backward)
  • Friction (backward)
  • Gravity (downward)
  • Normal force (upward)
• What is the force that acts perpendicular to the surface when an object is in contact with it?

  Normal contact force
• Why is the resultant force important in analyzing the motion of an object?

  It determines the overall effect of all forces
• If a skydiver is falling and experiences a downward force of 800 N due to gravity and an upward force of 600 N due to air resistance, what is the resultant force?

  200 N downward
• How does the resultant force affect the motion of an object if it is zero?

  The object remains at rest or moves at constant velocity
• What are the key components of a free body diagram?

  • Arrows representing forces
  • Sizes of arrows indicating magnitude
  • Directions of arrows indicating direction of forces
  • Labels for each force