Newton’s first law

• What is the main topic discussed in the study material?

  Newton's laws of motion
• What does Newton's first law state about an object in motion?

  An object remains in the same state of motion unless a resultant force acts on it
• What happens if the resultant force on an object is zero?

  A stationary object stays stationary and a moving object continues at the same velocity
• What is the definition of resultant force?

  The single force that could replace all the forces acting on an object
• How can Newton's first law explain uniform motion?

  It states that objects traveling with constant velocity have balanced forces acting on them
• What is an example of uniform motion according to Newton's first law?

  A car traveling at a constant velocity with balanced driving and resistive forces
• What is air resistance?

  A force of friction produced when an object moves through the air
• What is terminal velocity?

  The maximum speed of an object reached when forces are balanced by frictional forces
• How does Newton's first law apply to non-uniform motion?

  It explains situations where speed or direction changes, indicating unbalanced forces
• What happens when a car accelerates according to Newton's first law?

  The driving force from the engine is greater than the resistive forces, resulting in a non-zero resultant force
• What are the vertical and horizontal forces acting on a submarine?

  Both vertical and horizontal forces are acting on it, with each set balanced
• What does it mean if the horizontal resultant force on a submarine is zero?

  There is no horizontal acceleration
• What can be inferred if the vertical resultant force on a submarine is also zero?

  The submarine will continue with the same motion, either remaining stationary or moving at a constant speed
• How do horizontal and vertical forces affect a submarine's movement?

  Horizontal forces do not affect vertical movement and vice versa
• What are the key points of Newton's first law of motion?

  • An object remains in the same state of motion unless acted upon by a resultant force
  • If the resultant force is zero, a stationary object stays stationary and a moving object continues at the same velocity
  • Balanced forces result in uniform motion
• What are examples of uniform and non-uniform motion?

  Uniform motion:

  • Car traveling at constant velocity
  • Runner at top speed with balanced air resistance

  
  

  Non-uniform motion:

  • Car accelerating
  • Object falling with unbalanced air resistance
• How do forces act on a submarine?

  • Vertical and horizontal forces are present
  • Horizontal forces are balanced, resulting in zero horizontal acceleration
  • Vertical forces are balanced, resulting in zero vertical acceleration